XPS 15 - 9550 not able to reach 40Gbps over TB3?
 
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[Solved] XPS 15 - 9550 not able to reach 40Gbps over TB3?  

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anuraj1
(@madmartigan1)
Active Member
Joined: 4 years ago
 
Ah Interesting, thanks! I haven't been been disabling the 960m in Device Manager. Thanks for the driver tip also! I'll do this stuff when I get home from work and I'll update on this thread.
 
EDIT: Here are some pics of my setup. It is driving dual 28" 4K monitors.
Posted by: Splitframe
Posted by: anuraj1

Strangely, I can't get CUDA-Z to work on my Precision 5510 or my XPS 9550 with a Powercolor Devil Box and GTX 1080.

It works fine with just the 960m but when the eGPU is plugged in, the 960m automatically goes inactive and CUDA-Z can't detect any CUDA capable devices.

However, HWInfo and the Nvidia Control Panel both confirm that the GTX1080 is running at PCIE 3.0 x2.

Posted by: nando4

Yes, CUDA-Z works with a GTX 460.

Posted by: stryakr

I just purchased a MSI RX 480, but I have a GTX 460, would the tool still work with that older Nvidia card?

Be sure to install Nvidia Driver 375.70 and disable the 960m in the device manager. Unplug, plug and cuda-z works. 

The specific driver is just one that works best for me currently. The newer ones only achieve 1100mb/s instead of 1400

2018 15" Dell Precision 7530 (Q P3200) [8th,6C,H] + RTX 2080 Ti @ 32Gbps-TB3 (AKiTiO Node Pro) + Win10 [build link]  

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stryakr
(@stryakr)
New Member
Joined: 4 years ago
 

That eventually my goal, to replace my aging FX 8320 desktop; I worry though that mixing nVidia and AMD GPU solutions will be a problem for me. 

Which XPS 15 9550 do you have, as I have the i7 variation and wonder if the PCI lanes issues differ based on the CPU or if it's the entire platform from Dell that is the issue. 

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

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nando4
(@nando4)
Noble Member Admin
Joined: 4 years ago
 

So far the 2 lane issue has been detected on the XPS 9350/9360/9550 and Precision M5510. These are all the very thin systems where TDP  budgetting the architecture is important.

Precision M7510 having 4 lanes wired. M3510 unknown but follows the same chunky design where a samll bump in TDP going from 2->4 lanes PCIe on the TB3 controller isn't going to affect them much.

Posted by: stryakr

 

That eventually my goal, to replace my aging FX 8320 desktop; I worry though that mixing nVidia and AMD GPU solutions will be a problem for me. 

Which XPS 15 9550 do you have, as I have the i7 variation and wonder if the PCI lanes issues differ based on the CPU or if it's the entire platform from Dell that is the issue. 

   

eGPU Setup 1.35    •    eGPU Port Bandwidth Reference Table

 
2015 15" Dell Precision 7510 (Q M1000M) [6th,4C,H] + GTX 1080 Ti @32Gbps-M2 (ADT-Link R43SG) + Win10 1803 [build link]  


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survfate
(@survfate)
Eminent Member
Joined: 4 years ago
 
Hey man, what is your laptop stand, is it diy? Its perfect for my desk setup.
Posted by: anuraj1
Ah Interesting, thanks! I haven't been been disabling the 960m in Device Manager. Thanks for the driver tip also! I'll do this stuff when I get home from work and I'll update on this thread.
EDIT: Here are some pics of my setup. It is driving dual 28" 4K monitors.
Posted by: Splitframe
Posted by: anuraj1

Strangely, I can't get CUDA-Z to work on my Precision 5510 or my XPS 9550 with a Powercolor Devil Box and GTX 1080.

It works fine with just the 960m but when the eGPU is plugged in, the 960m automatically goes inactive and CUDA-Z can't detect any CUDA capable devices.

However, HWInfo and the Nvidia Control Panel both confirm that the GTX1080 is running at PCIE 3.0 x2.

Posted by: nando4

Yes, CUDA-Z works with a GTX 460.

Posted by: stryakr

I just purchased a MSI RX 480, but I have a GTX 460, would the tool still work with that older Nvidia card?

Be sure to install Nvidia Driver 375.70 and disable the 960m in the device manager. Unplug, plug and cuda-z works. 

The specific driver is just one that works best for me currently. The newer ones only achieve 1100mb/s instead of 1400

2012 15" ASUS K55VJ (GT635M) [3rd,2C,M] + GTX 1050 Ti @ 4Gbps-mPCIe2 (EXP GDC 8.4) + Win10 [build link]  

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XCVG
 XCVG
(@xcvg)
Trusted Member
Joined: 4 years ago
 

So far the 2 lane issue has been detected on the XPS 9350/9360/9550 and Precision M5510. These are all the very thin systems where TDP  budgetting the architecture is important.

Precision M7510 having 4 lanes wired. M3510 unknown but follows the same chunky design where a small bump in TDP going from 2->4 lanes PCIe on the TB3 controller isn't going to affect them much.

Again, speaking as a not-exactly-neutral XPS 15 owner, I don't know about that. And again, I don't think it matters.

The 9550 is known to overheat and throttle, doesn't cool its VRMs adequately, gets scarily hot when charging, and spins up its fans whenever anything is connected to the TB3 port. They clearly weren't very careful about thermal considerations when they designed this machine, and if they really were concerned they would have used the cheaper, cooler JHL6240. I'd be very surprised if this wasn't economics, pure and simple. My guess is they couldn't route four lanes without adding another layer to the board or otherwise increasing costs, so they just ran two instead and call it a day.

Dell cheaped out and lied to their customers about it. Within spec? Yes. What was advertised? No. Whatever technical justification they may or may not have does not justify swindling buyers out of half their promised speed.

Please don't take this as something against you. My discontent is directed toward Dell and Dell alone.

2015 15" Dell XPS 15 9550 (GTX960M) [6th,4C,H] + GTX 1080 @ 16Gbps-TB3 (Mantiz Venus) + Win10 [build link]  

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nando4
(@nando4)
Noble Member Admin
Joined: 4 years ago
 

I entirely understand your discontent. The XPS 13/15 was aimed as a Macbook killer.  Indeed 2015 Macbooks ran 16Gbps-TB2 whereas these XPS systems outwardly surpassed them as 32Gbs-TB3. Unbeknown by their owners, until TB3 PCIe peripherals were released, they actually ran 16Gbps-TB3 via a neutered x2 3.0 link from the TB controller to the root bridge.

Yes, Dell did cheap out, using 2014 DSL5110 controllers rather than the newer DSL6xxx ones. There would have been a tiny increase in TDP running 4 lanes rather than 2, however, it shows a bias towards DP rather than PCIe traffic down the 40Gbps TB3 channel.

I wish it wasn't so. Finding an argument against Dell in that mix will be difficult. Intel are more at fault outwardly advertising TB3 as 4 lanes of PCIe 3.0, then in the details saying it can be between 2-4 lanes of PCIe 3.0. Good luck if pursuing Intel.

Posted by: XCVG

 Again, speaking as a not-exactly-neutral XPS 15 owner, I don't know about that. And again, I don't think it matters.

The 9550 is known to overheat and throttle, doesn't cool its VRMs adequately, gets scarily hot when charging, and spins up its fans whenever anything is connected to the TB3 port. They clearly weren't very careful about thermal considerations when they designed this machine, and if they really were concerned they would have used the cheaper, cooler JHL6240. I'd be very surprised if this wasn't economics, pure and simple. My guess is they couldn't route four lanes without adding another layer to the board or otherwise increasing costs, so they just ran two instead and call it a day.

Dell cheaped out and lied to their customers about it. Within spec? Yes. What was advertised? No. Whatever technical justification they may or may not have does not justify swindling buyers out of half their promised speed.

Please don't take this as something against you. My discontent is directed toward Dell and Dell alone.

   

eGPU Setup 1.35    •    eGPU Port Bandwidth Reference Table

 
2015 15" Dell Precision 7510 (Q M1000M) [6th,4C,H] + GTX 1080 Ti @32Gbps-M2 (ADT-Link R43SG) + Win10 1803 [build link]  


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anuraj1
(@madmartigan1)
Active Member
Joined: 4 years ago
 

It's this one:  https://www.amazon.com/dp/B017DORX3M/ref=twister_B01DJD6NP0?_encoding=UTF8&psc=1

Posted by: survfate
Hey man, what is your laptop stand, is it diy? Its perfect for my desk setup.
2018 15" Dell Precision 7530 (Q P3200) [8th,6C,H] + RTX 2080 Ti @ 32Gbps-TB3 (AKiTiO Node Pro) + Win10 [build link]  

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kwinz
(@kwinz)
Active Member
Joined: 4 years ago
 

nando4, thank you for all the content you have posted and all the work you have put into this! Really appreciate it.

Did anybody hear back from Dell about this? Sales or support contact?

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

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nando4
(@nando4)
Noble Member Admin
Joined: 4 years ago
 

I personally have not heard anything back. Though I have not made any enquiries with Dell.

There's some feedback from affected users and their results from approaching Dell at https://www.reddit.com/r/Dell/comments/5lpo0g/design_flaw_in_xps_93509550_may_cause_tb3_ports/

Posted by: kwinz

 

nando4, thank you for all the content you have posted and all the work you have put into this! Really appreciate it.

Did anybody hear back from Dell about this? Sales or support contact?

   

eGPU Setup 1.35    •    eGPU Port Bandwidth Reference Table

 
2015 15" Dell Precision 7510 (Q M1000M) [6th,4C,H] + GTX 1080 Ti @32Gbps-M2 (ADT-Link R43SG) + Win10 1803 [build link]  


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XCVG
 XCVG
(@xcvg)
Trusted Member
Joined: 4 years ago
 

Reddit user TuringPointSoftware just got a response from Dell stating that this varies by revision and that newer 9550s (Q2 2016 onward) have all four lanes connected (source). However, he cautions to take this with a grain of salt, presumably becacuse Dell reps have provided false information in the past.

Does anyone have a newer 9550 to check? Mine is a very early model but had a new motherboard swapped in last June. It has two lanes connected.

2015 15" Dell XPS 15 9550 (GTX960M) [6th,4C,H] + GTX 1080 @ 16Gbps-TB3 (Mantiz Venus) + Win10 [build link]  

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