HP Envy 34" Curved eGPU setup recommendaitons
 
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HP Envy 34" Curved eGPU setup recommendaitons  

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itsage
(@itsage)
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Joined: 4 years ago
 

@daclina, That looks great! Your build might be one of the first non-iMac AIO desktop with an eGPU. We'd love to see a build guide when you have a chance.

Can you share more details on the third party 1m Thunderbolt 3 cable? The AIDA64 GPGPU is showing a lower speed than the typical x4 PCIe 3.0 TB3 connection.

 

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daclina
(@daclina)
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Joined: 5 months ago
 

Thanks a lot @itsage. What are the numbers that show the bandwidth and what should they be ideally?

The cable is an ANTSIG brand, black about 1m long. 

95498587 56D6 4887 92AD 18A189BF6D55

What is a recommended cable and where is the easiest it can be bought?

I will definitely do a build guide when I’m done with the tests.

This post was modified 3 months ago

HP Envy 34" Curved RX460

 
2017 34" HP ENVY Curved All-in-One (RX460) [7th,4C,T] + RX 580 @ 16Gbps-TB3 (HP OMEN Accelerator) + Win10 [build link]  


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joevt
(@joevt)
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Joined: 3 years ago
 

@daclina, your memory read and memory write numbers are under 1600 MB/s. That means the Thunderbolt controller is running as PCIe 2.0 x4 or PCIe 3.0 x2 (use HWiNFO to find out) or the Thunderbolt connection is only 20 Gbps instead of 40 Gbps.

Unlike macOS, Windows does not have a method to show Thunderbolt link rate. Maybe Linux does? I haven't tried recently.

That Thunderbolt 3 cable looks like it is only a USB-C cable which only allows Thunderbolt 2 speed (10 Gbps per lane, 20 Gbps total) instead of Thunderbolt 3 speed (20 Gbps per lane, 40 Gbps total). A real Thunderbolt 3 cable should have a Thunderbolt icon on it.

You didn't buy the Omen new, so maybe the seller didn't give you the original Thunderbolt cable that should come with the Omen or any Thunderbolt 3 device.

 

 

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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daclina
(@daclina)
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Joined: 5 months ago
 

@joevt, Thanks for the clarification.

Ok so it could be the controller (I will check with HWiNFO) or the cable, or both.

I have just ordered an official Apple 0.8cm Thunderbolt 3 cable, I have seen it mentioned here on the forums a few times, hence I though it should be decent enough to at least make sure I have a decent cable to test.

I'll report back when I get the cable and do some tests. 

 

HP Envy 34" Curved RX460

 
2017 34" HP ENVY Curved All-in-One (RX460) [7th,4C,T] + RX 580 @ 16Gbps-TB3 (HP OMEN Accelerator) + Win10 [build link]  


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daclina
(@daclina)
Active Member
Joined: 5 months ago
 

My new Apple Thunderbolt cable should arrive tomorrow. I'll post the updated (and hopefully better) numbers.

In the meantime, here's the HWINFO captures.

Annotation 2020 04 06 132431

Looks like it is reporting a x4 connection so likely to be the cable? Or am I misreading and it's PCIe 2.0 x4 and if so can anything be done?

This post was modified 3 months ago

HP Envy 34" Curved RX460

 
2017 34" HP ENVY Curved All-in-One (RX460) [7th,4C,T] + RX 580 @ 16Gbps-TB3 (HP OMEN Accelerator) + Win10 [build link]  


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daclina
(@daclina)
Active Member
Joined: 5 months ago
 

Ok so the new cable arrived and it showed marginal improvements only:

80cmapple

Here are some benchmarks with the Rx460 vs the Rx580 in the Omen Accelerator:

rx460 timespy
rx580 timespy

 

rx460 valley
rx580 valley

Although it is a vast improvement, I think given that it seems to be reading at 2x vs 4x, I'll move onto a new project. This time I'm thinking of picking up a r43sg-tb3, install windows on the SSD drive, and plug that into the 4x M.2 port, then test it direct with the Rx580 plugged in and have the Omen Accelerator plugged into the r43sg-tb3.

@itsage @joevt Would that work - m.2 -> r43sg-tb3 -> Omen Accelerator and if so would there be a big trade-off in performance for the cleanliness of the setup?

Off to finish off the build guide

This post was modified 3 months ago

HP Envy 34" Curved RX460

 
2017 34" HP ENVY Curved All-in-One (RX460) [7th,4C,T] + RX 580 @ 16Gbps-TB3 (HP OMEN Accelerator) + Win10 [build link]  


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joevt
(@joevt)
Noble Member
Joined: 3 years ago
 
Posted by: @daclina

My new Apple Thunderbolt cable should arrive tomorrow. I'll post the updated (and hopefully better) numbers.

In the meantime, here's the HWINFO captures.

Annotation 2020 04 06 132431

Looks like it is reporting a x4 connection so likely to be the cable? Or am I misreading and it's PCIe 2.0 x4 and if so can anything be done?

The GPU is always x4 in a Thunderbolt eGPU expansion box. You need to look at all the other devices higher up in the tree (skip the Thunderbolt controller downstream devices which incorrectly reports 2.5 GT/s x4 - only look at the Thunderbolt upstream bridge device of each Thunderbolt controller).  Start with Intel Kaby Lake - PCI Express Root Port #3. I think it's connected x2 to Bus #3 (because it says x2). This means the Thunderbolt controller in your laptop is limited to PCIe 3.0 x2 which explains why you can't get at least 2000 MB/s.

m.2 -> r43sg-tb3 -> Omen Accelerator  will not work because the r43sg-tb3 uses Thunderbolt 3 to connect to a Thunderbolt host, not to a Thunderbolt peripheral so it only works like this:
Computer -> Thunderbolt cable -> r43sg-tb3  -> r43sg -> GPU.

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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daclina
(@daclina)
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Joined: 5 months ago
 

Thanks for the clarifications @joevt. Not that I'm unhappy with the setup & performance, but I'd like to see how much better it can perform so I guess my only other option is to try out the r43sg and see how that performs when connected to the m.2 slot.

Thanks for all the help and I'll post back here when I get the r43sg device.

 

HP Envy 34" Curved RX460

 
2017 34" HP ENVY Curved All-in-One (RX460) [7th,4C,T] + RX 580 @ 16Gbps-TB3 (HP OMEN Accelerator) + Win10 [build link]  


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