Ultrabook Buyer's Guide: Best Choices for External GPU  

 

theitsage
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February 25, 2018 9:40 pm  

As we've gained a better understanding of Thunderbolt 3 (TB3) eGPU enclosures, the unknown rests on the performance of the Thunderbolt 3 host computer. Thin and light ultrabooks are often a top choice to pair with an external GPU. This article serves as a buyer's guide for choosing the best ultrabook to get the most out of a TB3 eGPU. The particular setup I'm using is an early 2018 Razer Blade Stealth with the Razer Core V2. This pairing is one of the highest performing TB3 ultrabook + eGPU setups as of Q1 2018. The Razer Blade Stealth shares many fundamental components with a handful of other Thunderbolt 3 ultrabooks that we will explore below.

Intel Thunderbolt Technology website has a list of certified Thunderbolt products. You can visit this link to find Thunderbolt 3 laptops currently available on the market. The multitude of choices can be overwhelming. Yet the specifications we're most interested in for external graphics use are not readily available. So what are the criteria you should consider when choosing the best ultrabook for external graphics pairing? Through hundreds of implementations and build guides, we've distinguished three key features:

ULV CPU

For this buyer's guide, we're focusing on the newest crop of ultrabooks with Thunderbolt 3 connectivity. They now sport the Intel 8th generation quad-core ULV processors, doubling the core count of the previous generation. The top turbo speed is dependent on both the CPU workload and the ultrabook's cooling system. If nearing the limits of TDP and CPU junction temperature (95˚-105˚ C), the CPU will throttle down performance. Thin, light systems are more than skin deep.

With nearly identical architecture to the previous generation, the 8th generation ULV CPU offers performance improvements by running double the number of cores, often at a more efficient reduced speed to maintain limits and thereby giving greater overall workload. These ultrabooks are the first revision with quad-core processors and should be future-proof for the next few years. At this time, the i7-8550U configuration was the highest performing, readily available ULV CPU.

SpecIntel Core i7-8550U @ 1.80GHzIntel Core i7-7600U @ 2.80GHz
Base Speed1.8 GHz2.8 GHz
Turbo SpeedUp to 4.0 GHzUp to 3.9 GHz
# of Physical Cores4 (2 logical cores per physical)2 (2 logical cores per physical)
Configurable TDP-up25W25W
First Seen on ChartQ2 2017Q1 2017
Single Thread Rating20792128
CPU Mark (Feb-2018)81115583

PCIe Lanes

Thunderbolt connection allows at most 4 PCI Express lanes between the host and the device. In a ULV CPU ultrabook, this means allocating 4 out of a maximum 12 PCIe lanes. There are several peripheral components inside a laptop that make use of these high-speed interconnect lanes. For a typical ultrabook the NVMe flash storage drive gets a x4 PCIe connection. The Wireless card and other components may use a few x1 PCIe connections. If there's a discrete graphics card, it will consume another x4 PCIe connection. Resource allocation conflicts arise when PC manufacturers decide how best to use these 12 lanes. Due to Thunderbolt 3 connectivity being a relatively new standard, Thunderbolt 3 ports are often not top priority.

2018 Razer Core Blade vs. 2017 Dell XPS 13 9360

One performance hindrance is a x2 PCIe 3.0 via Thunderbolt 3 connection. This is applicable for most single TB3-port ultrabooks, the Razer Blade Stealth being the exception. The Dell XPS 13 is perhaps one of the most popular ultrabooks in the past few years. Many aim to use it with an eGPU, but it's been plagued with only 2 lanes for its sole Thunderbolt 3 port. The good news is things are gradually changing with the emergence of Thunderbolt 3 external graphics solutions. At CES 2018 I had a discussion regarding this with Gary L., a Dell system engineer. He confirmed the latest 2018 XPS 13 9370 now provides 4 PCIe lanes for its dual Thunderbolt 3 ports.

The HWiNFO64 screen capture on the left shows PCIe configuration in the early 2018 Razer Blade Stealth. The PCI Express Root Port #5 [A1/C1] attaches to a x4 connection that connects to the Thunderbolt 3 [Alpine Ridge] controller. This controller then hosts a single Thunderbolt 3 port. We also see PCI Express Root Port #3 [A1/C1] attaches to the Killer Wireless-n/a/ac 1535 Network Adapter. Last but not least, PCI Express Root Port #9 [A1/C1] attaches to a Samsung NVMe 960 controller. The HWiNFO64 screen capture (on the right) of a Dell XPS 9360 shows its inferior x2 PCIe connection to the Thunderbolt 3 controller.

OPI Mode

An infrequently discussed feature is the On Package DMI interconnect Interface (OPI). ULV processors such as the i7-8550U use OPI because, unlike HQ or HK processors, it lacks the Direct Media Interface (DMI 3.0) to facilitate communication between the PCH and CPU. The system designers can choose to either extract the most performance or optimize energy consumption on these ULV processors. OPI 2GT/s is ideal for extended mobile use at low-power tasks, while OPI 4GT/s is excellent for high-performance applications. These two OPI modes operate at a max theoretical throughput of 20Gbps and 40Gbps respectively. When you consider Intel's claim of 40Gbps bandwidth for Thunderbolt 3 connectivity, it makes total sense OPI 4GT/s is the more appropriate choice for eGPU use.

Unfortunately the OPI settings are not something users can change at their convenience. The settings are baked into the system firmware/BIOS. At the moment PC manufacturers do not disclose the OPI mode in their marketing information. The only way to find out is to run performance tests yourself. If the ultrabook has an NVMe storage controller, read speed should exceed 1,800 MB/s in benchmark software such as ATTO to confirm the laptop is set to OPI 4GT/s. 

As seen in the AIDA64 benchmarks above, OPI 4GT/s systems can extract the most out of Thunderbolt 3 eGPU. Keep in mind that Intel caps the throughput in these eGPU enclosures at roughly 22Gbps to preserve bandwidth for DisplayPort transmission over Thunderbolt 3. As external graphics adoption and demand grows, we hope Intel and partners dedicate more resources to optimize Thunderbolt 3 performance in general and external graphics use in specific.

Best Ultrabooks

Below are the best ultrabooks with the trinity of performance specs to host an external GPU. If you have an Intel 8th gen quad-core ultrabook not in this list and can confirm x4 PCIe + OPI 4GT/s, please share your findings by posting a build guide in our forum. We'll keep this list up-to-date with user reports.

HP Spectre X360

$1,099

i7 Starting MSRP

  • Intel 8th gen quad-core
  • x4 PCIe Connection
  • OPI 4GT/s Mode
  • 2 x TB3 ports
  • User Build Guide

Price on Amazon

Lenovo Yoga 920

$1,299

i7 Starting MSRP

  • Intel 8th gen quad-core
  • x4 PCIe Connection
  • OPI 4GT/s Mode
  • 2 x TB3 ports
  • User Build Guide

Price on Amazon

Dell XPS 13 9370

$1,399

i7 Starting MSRP

  • Intel 8th gen quad-core
  • x4 PCIe Connection
  • OPI 4GT/s Mode
  • 2 x TB3 ports
  • User Build Guide

Price on Amazon

Lenovo X1 Carbon

$2,099

i5 Starting MSRP

  • Intel 8th gen quad-core
  • x4 PCIe Connection
  • OPI 4GT/s Mode
  • 2 x TB3 ports
  • User Build Guide

Price on Amazon

Want more performance?

The rumor mill suggests that Intel will release 8th-generation 6-core (hex) Q 45W CPUs. These will be in laptops with larger chassis to accommodate more substantial cooling systems, coupled with bulkier power supplies to drive them. A bigger package that packs a bigger punch. It's definitely worth the wait if you can trade portability for performance. 

Older notebook options?

eGPU.io user builds listed as 32Gbps-TB3 are confirmed to offer full Thunderbolt 3 bandwidth performance. At the link below, you can select LCD, CPU and then review the System Brand and Model widget for options to consider. Proceed to review user builds with your targeted system.

https://egpu.io/external-gpu-implementations-table/?table_filter ="32Gbps-TB3 "

Edited: 2 months  ago

Best ultrabooks for eGPU use

eGPU enclosure buying guide

56 external GPU build guides


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Fred_K
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February 25, 2018 9:40 pm  

Well written guide! I am excited to see the recent development with eGPUs. My next laptop will definitely be a thin and light laptop with an eGPU. Personally I hope Apple will release a 13" MBP with 4-core CPU in the near future (Or even 6-core 15") with native eGPU support.


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(@viktor_sinelnikov)
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February 26, 2018 1:44 am  

I heard that this processor doesn't work on 4.0GGz in gaming. It reaches it, works 5 mins, then gets overheated and throttle to 1.8GGz. Is it true?


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(@laxlad)
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February 26, 2018 1:45 am  

Very informative article , but it does leave me with some questions. About the pcie lanes since there are 12 total if I was going to purchase a ultrabook 2-in-1 with a dedicated graphics card would it be better to get a SATA3 ssd instead of an NVMe(because NVME takes up x4 pcie lanes). I only ask because of the upcoming ASUS Zenbook Flip 15 (i7-8550u, 16gb ram ddr4, GTX1050) UX561UD. It gives the option of and HDD, sata3 ssd, or a pcie ssd instead. Does a sata3 ssd take up any pcie lanes? This leaves me to wonder if the advertised Thunderbolt 3 will be a full 4x pcie or it will be 2x pcie. Sorry if these are dumb questions I am completely new to this.

In other words
12 pcie lanes
-4 lanes for dedicated gpu
-4 lanes for NVME storage if chosen
-1 lane wifi
-1 maybe usb 3.1

https://www.asus.com/2-in-1-PCs/ASUS-ZenBook-Flip-UX561UD/ The website says that the thunderbolt 3 has 40gbs transfer speeds.

I also used this site for reference
http://www.startlr.com/asus-zenbook-flip-15-ux561ud/

Edited: 4 months  ago

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Eightarmedpet
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February 26, 2018 7:44 am  

That Razer core looks dead nice... have I ever mentioned my desire for more compact high end enclosures? 😉

Also, surely the MacBook Pro 13” deserves a recommendation as one of the few (only 2?) with built in official egpu support (ok, coming very soon)?

2017 13" MacBook Pro Touchbar + GTX1060@32Gbps-TB3 (AKiTiO Thunder3) + Win10
2017 13" MacBook Pro Touch Bar + GTX1070@32Gbps-TB3 (Sonnet Breakaway Box) + Win10
---
LG 5K Ultrafine flickering issue fix


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Eightarmedpet
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February 26, 2018 9:33 am  

I have my doubts over these latest gen CPU's too, most games favour clock speed over core and I imaging the extra cores mean more heat and quicker throttling. Of course thats all just guess work from me, going to try to look up some comparison benchmarks...

2017 13" MacBook Pro Touchbar + GTX1060@32Gbps-TB3 (AKiTiO Thunder3) + Win10
2017 13" MacBook Pro Touch Bar + GTX1070@32Gbps-TB3 (Sonnet Breakaway Box) + Win10
---
LG 5K Ultrafine flickering issue fix


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4chip4
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February 26, 2018 11:28 am  

Even if you have a game which mismanages cores/multithreading, Windows has a processor affinity mechanism in task manager that, err... manages this:

...and since the dual-core turbo-boost of 8th gen CPUs is actually considerably higher than 7th gen, there should be no reason why they would work not only as good as, but better than 7th gen CPUs. My experience in games and VR has been improved quite a bit by going from 7500U to 8550U. YMMV.

Edited: 4 months  ago

2017 HP Spectre x360 15 i7-8550U GTX150 + GTX970@16Gbps-TB3 (HP Omen Accelerator) + Oculus Rift + Win10 [no guide]
HP Omen Accelerator Thunderbolt 3 enclosure legs stand removal walkthrough
Employed by HP, but my posts and opinions expressed on this forum are my own.


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4chip4
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February 26, 2018 11:35 am  

@laxlad The PCI lane allocation is a hardware (motherboard) thing, changing how the drive is connected will not change this, unless the laptop with the SATA drive physically doesn't have the NVMe port (and has a different motherboard, which is unlikely). Normally the non-NVMe option exists to free that port for use with another device or make the HDD cheaper, I have not yet seen a single device where those lanes were allocated to TB3.

2017 HP Spectre x360 15 i7-8550U GTX150 + GTX970@16Gbps-TB3 (HP Omen Accelerator) + Oculus Rift + Win10 [no guide]
HP Omen Accelerator Thunderbolt 3 enclosure legs stand removal walkthrough
Employed by HP, but my posts and opinions expressed on this forum are my own.


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 chx
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February 26, 2018 12:57 pm  

12 pcie lanes
-4 lanes for dedicated gpu
-4 lanes for NVME storage if chosen
-1 lane wifi

USB C is provided by the Thunderbolt circuit as far as I know so we don't need separate lanes. Indeed the laptop you linked has two Thunderbolt 3 ports which makes 4 PCIe lanes a hard requirement. The laptop either connected the GPU over x2 or the NVMe socket only has two lanes. My bet is on the latter -- but the GPU wouldn't be bottlenecked by x2, it's only an 1050.


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Eightarmedpet
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 chx
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February 26, 2018 1:29 pm  

Sigh. Another post purporting that x4 is significantly better than x2. This very site has the benchmarks to prove it wrong at https://egpu.io/forums/mac-setup/pcie-slot-dgpu-vs-thunderbolt-3-egpu-internal-display-test/ and also notebookcheck at https://www.notebookcheck.net/eGPU-Two-PCI-e-lanes-no-problem.266658.0.html

The truth is that x2 vs x4 only matters if someone wants to use an 1070 or faster to accelerate the internal display. Otherwise, you could pick anything. I am trying to spread this information but it's an uphill battle with articles like this.

Edited: 4 months  ago

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theitsage
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February 26, 2018 2:00 pm  

@chx if you get to choose between a TB3 system with x2 PCIe and another with x4 PCIe, which one would you pick?

I'm in MN and there's a lot of snow on the ground this past week. Most of the 4-5 month long winter, the roads are rather nice and dry. I don't get to see the benefits of snow tires very often. When I do, it's significantly better than all-season tires.

This article serves as a buying reference to pick the best ultrabook for eGPU use. It's not reasonable to put an asterisk saying x2 PCIe does not matter unless you plan on accelerating the internal display with more powerful GPUs such as GTX 1070/RX Vega 56. The very selling point of external graphics is GPU upgradability.

Best ultrabooks for eGPU use

eGPU enclosure buying guide

56 external GPU build guides


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 chx
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February 26, 2018 2:08 pm  

There are many different considerations when picking a laptop and Thunderbolt bandwidth is only one of them and if we would tell people to not bother with that unless X then their picking would be that much easier. 

This article needs a first sentence saying "if you are using an external monitor then this article doesn't apply, all of them are the same". That's all I am trying to say.


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(@laxlad)
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February 26, 2018 2:29 pm  

Thanks for the info guys.  I didn’t clarify in my post but the reason I was concerned about the 4x pcie lanes because I plan on connecting an ssd and Ethernet connection to the egpu (mantiz Venus).  from what I gather 4 lanes handle this better than 2.  But if I were to just connect an egpu without any other peripherals I would be less concerned with 2 vs 4 lanes.  Ownordisown in YouTube does a very good video showing the marginal difference between 2 vs 4 lanes when it comes to just using an egpu without connected peripherals.

thankyou all for the responses it’s been very informative


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Joikansai
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February 26, 2018 10:21 pm  

Greetings 
Very nice guide. I’m newbie here, this forum helped me a lot. Now I’m just curious why should i undervolting my i77500U  (Blade Stealth) with i7500 to be able to play AC Origins on internal screen (1440p, high) on Razer Core v2 with evga 1080 sc. Is it my ultrabook CPU too weak on default setting to play it? Because  on my i7 7700 HQ gaming laptop, i don’t need to close all running apps to run AC Origins with my Razer Core. Is there any gpu recommendation for UCPU, like price for performance for example? I have also 1080Ti, and I think I would sell it, because it is too bottleneck to both of my systems.


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irev210
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February 27, 2018 1:19 am  

A small but meaningful typo.

TDP max on 8550u is not 15w, it can tdp up to 25w sustained while it can turbo to over 35w.

This can mean really big differences in performance when gaming on an eGPU where CPU power is needed.

Ideally, you want a laptop that can send 25w to your 8550u without power or temp throttling.  That's good for some serious performance increases depending on workload.


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4chip4
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February 27, 2018 11:02 am  

You're right it's wrong to say TDP max is 15W, but it's also misleading to say it can do sustained 25W, because that depends on the cooling architecture of the device. Most ultrabooks today will be doing 15W sustained with 25W Boost.

CPUs nowadays actually have three (manufacturer provided) TDP modes of operation. This is not just about changing TDP wattage in XTU and such, these are actually distinct limits/modes of operation, with different guaranteed frequencies (c in cTDP for configurable), for example for the 8550U:

(nominal) TDP: 15W (1.8GHz)
cTDP up: 25W (2GHz)
cTDP down: 10W (800MHz)

The important part to understand is that cTDP up is not a "normal" nor dynamic mode (ie it's not Boost), but rather a "full steam ahead, engines be damned!" mode - it requires extra *core* cooling, which will not be normally present in ultrabooks. In addition, Boost and cTDP are not mutually exclusive, Boost goes *on top* of cTDP up (that's how you get to 35W+ draws).

Edited: 4 months  ago

2017 HP Spectre x360 15 i7-8550U GTX150 + GTX970@16Gbps-TB3 (HP Omen Accelerator) + Oculus Rift + Win10 [no guide]
HP Omen Accelerator Thunderbolt 3 enclosure legs stand removal walkthrough
Employed by HP, but my posts and opinions expressed on this forum are my own.


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irev210
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February 27, 2018 12:36 pm  

Right, completely depends on the OEM implementation.

I recommend that egpu.io start adding laptop tdp and performance stats as the difference is striking.

Check out notebookcheck's recent roundup - https://www.notebookcheck.net/A-performance-comparison-of-all-new-ThinkPad-notebooks.286486.0.html

The one laptop can pull 44w of tdp, crushing all other laptops.  Just amazing.

When selecting a laptop for egpu, proper tb3+proper power and thermal designs are required.

Edited: 4 months  ago

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4chip4
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February 27, 2018 4:05 pm  

Even those short bursts of 44W don't come for free - you can see that the CPU hits 100C within seconds. Performance-wise, that's fine, but it definitely won't help silicon (and especially battery) degradation, and makes for a nice lap-warmer 🙂 

In practical terms, if having a "cTDP up" device with x4 lanes is so important, what you're saying is "I want a HQ chip" - where you get all the goodies - tons of cores, tons of PCI lanes, high minimum clocks. U chips never were about raw performance, but striking a good balance between battery life and performance. The main reason we're having this discussion is because chips like the i7-8700H have not started selling yet. Why cook a 8550U at 44W, when for the same draw (and money), the 8700H can have 6 cores at ~3Ghz under full constant load.

Edited: 4 months  ago

2017 HP Spectre x360 15 i7-8550U GTX150 + GTX970@16Gbps-TB3 (HP Omen Accelerator) + Oculus Rift + Win10 [no guide]
HP Omen Accelerator Thunderbolt 3 enclosure legs stand removal walkthrough
Employed by HP, but my posts and opinions expressed on this forum are my own.


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irev210
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February 28, 2018 3:16 pm  

@4chip4 - you make some good points, here are my thoughts

Even those short bursts of 44W don’t come for free – you can see that the CPU hits 100C within seconds. Performance-wise, that’s fine, but it definitely won’t help silicon (and especially battery) degradation, and makes for a nice lap-warmer

  • Are you saying that Intel doesn't properly design their CPUs or that lifespan will shorten if they are used this way?  I'd love to see any data you have showing that designing Intel CPUs around Intel's own power/thermal limits will result in shortened design lifespan.
  • I am also assuming that the majority of people on eGPU.io are looking for CPU performance while attached to a eGPU, so battery isn't really used nor is it on your lap.
  • Please note that the new Dell XPS 13 9370 bottom runs much cooler than many of its competitors, despite using more power, so it doesn't really make for a nice lap warmer vs. its 15w peers

In practical terms, if having a “cTDP up” device with x4 lanes is so important, what you’re saying is “I want a HQ chip” – where you get all the goodies – tons of cores, tons of PCI lanes, high minimum clocks. U chips never were about raw performance, but striking a good balance between battery life and performance. The main reason we’re having this discussion is because chips like the i7-8700H have not started selling yet. Why cook a 8550U at 44W, when for the same draw (and money), the 8700H can have 6 cores at ~3Ghz under full constant load.

  • First off, you can't cook a 8550u, you will temp throttle.  You can have a 15w TDP cpu and a 25W TDP cpu that operate at the exact same temp or have the 25W TDP cpu run even cooler/faster than the 15W TDP cpu
  • For example, look at the XPS 13 9360 vs the 9370.  The last generation actually runs hotter despite only taking the 8550u to 15w TDP vs. the new 9370 which runs at ~25w TDP and operates at lower temps.  It also runs cooler than the HP Spectre 13t and 13" x360
  • What I am saying is, if you had two equal choices, it is more logical for eGPU users to pick the laptop that has more performance, particularly since in gaming CPU can really improve the overall gaming experience.  Unfortunately, Dell priced the XPS 13 9370 at a very high price, so the choices aren't very equal.
  • I don't want a HQ chip, look at the smallest form factor you can get a HQ chip... it's not 2.6 pounds.
  • The U is about TDP parameters.  Just because the processor can work well at 25W sustained and not leak power like crazy when you are on battery life doesn't mean it is a bad choice.  CPUs have evolved and we are seeing some really unique offerings.

I get what you are saying but it's pretty ridiculous to suggest that by an OEM offering a 25W solution in a 13.3" package will somehow cook the silicon when I clearly just demonstrated that 15W solutions can and do run even hotter.  The key takeaway here is that you can plug it into a power source, get 20% extra performance for "free" without any loss of portability/battery life.

The last thing we want at eGPU.io is for someone to buy a 8550u that steps down to 7.5w and they are completely confused why their very expensive setup is not performing like other 8550U setups OR if someone is asking about a 8250u vs a 8550u that they understand under a heavy workload, both are going to be power and/or temp throttled anyway so it doesn't really matter what they choose.  The last thing I'd want to see is a potential eGPU gamer to spend the extra money on an 8550u cpu when they will end up being temp/power throttled and they should have spent the extra 200 on a different laptop that offered better cooling or maybe a better eGPU box.

We just need to understand the capabilities of the different offerings on the market to help people select the device that will best meet their needs.


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theitsage
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February 28, 2018 3:33 pm  

@4chip4 and @irev210 Thank you for the insights. I revised "Max TDP" to "Configurable TDP-up" to 25W.

Best ultrabooks for eGPU use

eGPU enclosure buying guide

56 external GPU build guides


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ondert
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March 1, 2018 3:59 pm  

How about LG Gram? LG has added 4-line Pci-e supported Thunderbolt 3 port on the latest iteration.


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theitsage
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March 1, 2018 4:02 pm  

@ondert There are a few more laptops that should be good candidates just like the new LG Gram you mentioned. We're waiting for actual implementation and confirmation that these laptops have x4 PCIe over TB3 as well as OPI 4GT/s before adding them onto the list.

Best ultrabooks for eGPU use

eGPU enclosure buying guide

56 external GPU build guides


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4chip4
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March 1, 2018 5:28 pm  

Are you saying that Intel doesn’t properly design their CPUs or that lifespan will shorten if they are used this way?  I’d love to see any data you have showing that designing Intel CPUs around Intel’s own power/thermal limits will result in shortened design lifespan.

Umm, yes? Intel gives you a warranty, which is based on a statistical model. Silicon ages, and the degradation rate is correlated with both temperature and number of executed cycles even if you operate within the parameters. Intel does not know or has a say what the thermals will be in an OEM device. The 100C max junction temp is not a "99C is perfectly fine under any condition" and "101C is bad". The higher you go, and harsher the thermal shocks, the higher statistical chance of silicon failure. I'm not saying this is a big problem or that many devices will break down - but it certainly doesn't help the device lifetime.

I am also assuming that the majority of people on eGPU.io are looking for CPU performance while attached to a eGPU, so battery isn’t really used nor is it on your lap.

I'm talking about temp-based battery life degradation - batteries degrade faster if heated, even if they are not in active use. Again, how much is dependent on the design, but most designs are focusing on getting the heat out, rather than protecting the battery.

Please note that the new Dell XPS 13 9370 bottom runs much cooler than many of its competitors, despite using more power, so it doesn’t really make for a nice lap warmer vs. its 15w peers

Obviously I was joking about lap-warming - the thermals are far more complex topic than that. Good designs spread the heat around as much as possible to reduce hotspots (which might be a conflicting goal with battery life as said above).

First off, you can’t cook a 8550u, you will temp throttle.  You can have a 15w TDP cpu and a 25W TDP cpu that operate at the exact same temp or have the 25W TDP cpu run even cooler/faster than the 15W TDP cpu

The primary goal of temp throttling is just to prevent  imminent failure - it doesn't help with the log term silicon and thermal wear'n'tear.

I don’t want a HQ chip, look at the smallest form factor you can get a HQ chip… it’s not 2.6 pounds.

Well, this is the part of having the cake and eating it too - there is a reason for that chip size, and it has to do with (drumroll) thermals and silicon 🙂 It's like trying to get out more horsepower of a small engine in order to fit a small chassis. There is a reason those larger engines exist.

The U is about TDP parameters.  Just because the processor can work well at 25W sustained and not leak power like crazy when you are on battery life doesn’t mean it is a bad choice.  CPUs have evolved and we are seeing some really unique offerings.


 The U in the Intel Chips stands for Ultra-low powerI understand you want to max out performance and TDP, but that's not what the U series was originally meant for.

I get what you are saying but it’s pretty ridiculous to suggest that by an OEM offering a 25W solution in a 13.3″ package will somehow cook the silicon when I clearly just demonstrated that 15W solutions can and do run even hotter.

What I'm saying is that every OEM designs their thermal systems. Yes, you can make a good 25w design, and yes, you can make a bad 15W design. There are plenty of tradeoffs to make (thermal buffer, weight, volume, layout, battery life/size). In the example you've shown the tradeoff was that CPU temps go very high, very quick. I don't like that and think that's on the risky side. For some it's irrelevant.

The key takeaway here is that you can plug it into a power source, get 20% extra performance for “free” without any loss of portability/battery life.

We can agree to disagree on this one 🙂 TANSTAAFL

2017 HP Spectre x360 15 i7-8550U GTX150 + GTX970@16Gbps-TB3 (HP Omen Accelerator) + Oculus Rift + Win10 [no guide]
HP Omen Accelerator Thunderbolt 3 enclosure legs stand removal walkthrough
Employed by HP, but my posts and opinions expressed on this forum are my own.


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irev210
(@irev210)
Trusted Member
Joined:12 months  ago
Posts: 51
March 2, 2018 9:38 pm  

We can agree to disagree on this one 🙂 TANSTAAFL

The double standard is somewhat amusing.  Your HP laptop runs hotter you know; according to your long winded explanation of thermodynamics, your HP laptop probably lasts only 50% as long as the Dell 9370.  All of what you just said basically said the Dell's superior thermal solution and cooler operating temps make it an excellent choice 🙂

According to your link, since Dell laptop battery doesn't get as hot as the spectre x360, it will last much longer  🙂

So based on all that, you should probably switch laptops asap!!!!

In all seriousness, I personally don't think that there is any life difference between the spectre x360 and the dell xps 9370... just different design choices that lead to different performance characteristics.  If you disagree, that's fine too.

 


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(@timur_kristof)
New Member
Joined:3 months  ago
Posts: 1
March 6, 2018 6:05 pm  

Out of curiosity, what's that big-ass monitor on the first picture of this article?


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theitsage
(@itsage)
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Joined:2 years  ago
Posts: 2438
March 6, 2018 6:16 pm  

@timur_kristof It's a Samsung CHG90 49-inch 32:9 FreeSync 2 monitor.

Best ultrabooks for eGPU use

eGPU enclosure buying guide

56 external GPU build guides


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4chip4
(@4chip4)
Estimable Member
Joined:11 months  ago
Posts: 186
March 9, 2018 11:11 am  

@irev210 No, I *am* agreement that different design choices lead to different characteristics. What I didn't agree with is that those design limitations are random or largely irrelevant (ie that bumping wattage is "free"). There is a reason why the same chips have different thermal and power limits - and it's not that somebody just forgot to tick a box (regardless of who the manufacturer is).

Here's an example for the specific two devices you mentioned - x360s and XPSes do not have 1:1 the same target markets, it's just that for eGPU uses we need to work backwards due to the TB limits. The x360 is a different form factor and meant for a slightly different target market than a XPS 9370, as it needs to function as a tablet as well, so the thermal design IS bound to be different than a traditional laptop. In tablet mode, you have more limitations on the bottom exhaust, so you need to be able to radiate more heat topside, or the device will be constantly thermally throttled when in tablet mode. TANSTAAFL. If that's an issue, and you don't need x360 functionality... Then why x360? Even within the HP offering, you're better off with a 13t - it's cooler AND sleeker AND has the same TB3 ports.

2017 HP Spectre x360 15 i7-8550U GTX150 + GTX970@16Gbps-TB3 (HP Omen Accelerator) + Oculus Rift + Win10 [no guide]
HP Omen Accelerator Thunderbolt 3 enclosure legs stand removal walkthrough
Employed by HP, but my posts and opinions expressed on this forum are my own.


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wimpzilla
(@wimpzilla)
Reputable Member
Joined:1 year  ago
Posts: 337
March 18, 2018 11:14 pm  

Hardware Unboxed compared the TB3 2x/4x pci-e bandwidth difference in game using the same cpu.

Edited: 3 months  ago

2012 13-inch Dell Latitude E6320 + R9 270X@4Gbps-mPCIe (EXP GDC 8.4) + Win10
E=Mc²


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(@genium_me)
Active Member
Joined:3 weeks  ago
Posts: 5
May 31, 2018 12:32 pm  

Very helpful thank you!
Two questions,
first rather theoretical, TB3 right now supports up to 40GBps but we are only connecting 4PCIe 3rd gen lanes (4x8GBps), now would it be possible - or rather - useful to connect 5 or 6 PCIe lanes to a TB3 port? would that lower the performance drop we currently see on GPUs in cores?
now secondly a very specific question:
Is there a reason the MateBook X pro is not listed as a good device for eGPUs?
Even so mobilTechReview states that the TB3 has 4 lanes there is still controversy about that is that the reason?
Or are there issues in setting up a box with the Xpro? In OneCoolThing they mentioned having issues setting up a razer core X - can anyone confirm or explain why that is ?
Thanks for the article and any answeres i can get to the above


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theitsage
(@itsage)
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Joined:2 years  ago
Posts: 2438
May 31, 2018 5:25 pm  

@genium_me The MateBook X Pro is not on the list because the dGPU model uses a 2-lane PCIe connection.

Best ultrabooks for eGPU use

eGPU enclosure buying guide

56 external GPU build guides


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