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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rhx123
(@rhx123)
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Here you go

XPS 13 9360 + Acer Graphics Dock


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julianpoyo
(@julianpoyo)
Active Member
Joined: 5 years ago
 

What does the "device to device" number mean?

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)
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Joined: 5 years ago
 

Just had a browse of the XPS 9350 lspci.txt output here. Can see:

  • 0:1c.0 (port1) is configured as x2 3.0 (16Gbps).  The good news is that port can be switched to x4 3.0 mode. The question is whether the lanes 2-4 are electrically wired to the TB3 controller? Something Dell will need to answer since there are no readily available tools for us to switch the BIOS locked link width ourselves. x2 3.0 will give a maximum of 16Gbps bandwidth.
  • 0:1d.0 is configured as x4 3.0. It hosts the Samsung PCIe SSD which runs at x4 3.0. If fancy a NGFF.M2 eGPU and don't mind underside wiring then using this port would give us a 32Gbps eGPU using say a BPlus PE4C 4.1.
 
Posted by: Richard

 

Unfortunately same issue on XPS 13 9360.

  

eGPU Setup 1.35    •    eGPU Port Bandwidth Reference Table

 
2015 15" Dell Precision 7510 (Q M1000M) [6th,4C,H] + GTX 1080 Ti @32Gbps-M.2 (ADT-Link R43SG) + Win10 1803 // compares M.2 vs TB3 performance inc unoptimized H-CPU BIOS [build link]  


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itsage
(@itsage)
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Thank you for the insights @Nando4. XPS 13 9350 is also hovering right at 1400 MiB/s.

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nando4
(@nando4)
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XPS 9350/9360/9550 all running 16Gbps TB3 (half advertised)

Yes, XPS 9350/9360/9550 all confirmed running at 16Gbps (~1400MiB/s) from their TB3 port. TB3 is specced at 32Gbps (x4 3.0) for PCIe traffic so we'd be looking for double those numbers.

Anybody affected may consider logging a support call to get this issue resolved via BIOS fix, replacement systemboard or a refund on the basis of performance under delivery.

I wish it wasn't so as too am eyeing Dell Precision/XPS machines with TB3 ports. Holding off until we get some more answers from Dell about this.

Posted by: itsage

 

Thank you for the insights @Nando4. XPS 13 9350 is also hovering right at 1400 MiB/s.

   

eGPU Setup 1.35    •    eGPU Port Bandwidth Reference Table

 
2015 15" Dell Precision 7510 (Q M1000M) [6th,4C,H] + GTX 1080 Ti @32Gbps-M.2 (ADT-Link R43SG) + Win10 1803 // compares M.2 vs TB3 performance inc unoptimized H-CPU BIOS [build link]  


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itsage
(@itsage)
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I'll run the 1.4.10 BIOS upgrade tonight and see if that improves the speed.

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2021 14" Microsoft Surface Laptop Studio [11th,4C,H] + RTX 2080 Ti @ 32Gbps-TB4 (WD_Black D50) + Win11 [build link]  


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nando4
(@nando4)
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15" Precision M7510 has x4 3.0 (32Gbps) root PCIe port

Some good news. A least a Dell Precision M7510 isn't affected. It does have two x4 3.0 root PCIe ports configured. From the lspci.txt  here:

0:1c.4 (port5) = x4 3.0 ->  [ probably the TB3 controller, not showing probably because not used ]0:1d.0 (port9) = x4 3.0  -> Samsung PCIe SSD

So 15" Precision M5510 or XPS 9550 users could side grade to a Precision M7510 as a workaround to get 32Gbps-TB3 bandwidth.

We don't know whether the budget Precision M3510 is also affected. Still, it could be a free Dell side grade to a M7510 as a fix if is it was. Would get a significantly pricier machine in the process.

eGPU Setup 1.35    •    eGPU Port Bandwidth Reference Table

 
2015 15" Dell Precision 7510 (Q M1000M) [6th,4C,H] + GTX 1080 Ti @32Gbps-M.2 (ADT-Link R43SG) + Win10 1803 // compares M.2 vs TB3 performance inc unoptimized H-CPU BIOS [build link]  


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Splitframe
(@splitframe)
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Got a reply back from Dell support that roughly equates to:

"Thank you for your in depth analysis of the problem,
we notified engineers about this and keep you posted"

It's something ¯\_(ツ)_/¯

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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bananasplit
(@bananasplit)
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What were the results?

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)
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Joined: 5 years ago
 

+1. I too am eager to hear what Dell propose to get full 32Gbps performance on affected Dell XPS 9350/9360/9550 and Precision M5510.

Posted by: bananasplit

 

What were the results?

   

eGPU Setup 1.35    •    eGPU Port Bandwidth Reference Table

 
2015 15" Dell Precision 7510 (Q M1000M) [6th,4C,H] + GTX 1080 Ti @32Gbps-M.2 (ADT-Link R43SG) + Win10 1803 // compares M.2 vs TB3 performance inc unoptimized H-CPU BIOS [build link]  


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