2020 Dell XPS 15 7590 [9th,6C,H] + RTX 2060 over Thunderbolt 3 inside Lenovo Boo...
 
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2020 Dell XPS 15 7590 [9th,6C,H] + RTX 2060 over Thunderbolt 3 inside Lenovo BoostStation enclosure stuck at 2.5 GT/s  

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SU2xU1
(@su2xu1)
New Member
Joined: 6 months ago
 

Hi all,

 

I'm using a Lenovo BoostStation with an RTX 2060, however, it seems to be stuck at 2.5 GT/s even under heavy load (MS Flight Simulator), which then shows the GPU as the constraint:

image

 For this test I have disabled the iGPU and dGPU on my laptop, and only the external display connected to the eGPU is enabled. The laptop display is disabled. I have not connected any other peripherals to the eGPU even though it supports a SATA SSD and has a few USB slots.

The PCIe root and upstream port seem to be doing 8 GT/s when under load:

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but the downstream port and the following upstream port are stuck at 2.5 GT/s:

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everything down from there is doing 8 GT/s:

image
image

 

The performance in terms of frame rates I get from my RTX 2060 is significantly lower than what other users with the same card report and I have confirmed no CPU throttling. In fact, its performance is closer to my discrete GTX 1650 than to what other users report for this card, so I suspect this is the problem.

 

Do eGPU users get higher PCIe speeds than 2.5 GT/s? Can I solve this?

This topic was modified 5 months ago

Dell XPS 15 7590 (i7-9750H + 32 GB DDR4 @ 2667 MHz) with Lenovo Legion BoostStation (RTX 2060) over Thunderbolt 3.


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

You are seeing the app query the PCIe register space and decipher it. This often not reporting correctly for Thunderbolt buses. Can confirm this by running CUDA-Z or AIDA64 and comparing to maximum bandwidth values recorded at https://egpu.io/builds#perf

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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SU2xU1
(@su2xu1)
New Member
Joined: 6 months ago
 

@nando4, Thanks, the Host to Device speed I get is comparable to what is recorded on that page. I guess that means it is performing at its best and won't do any better. Thanks!

image

 

Dell XPS 15 7590 (i7-9750H + 32 GB DDR4 @ 2667 MHz) with Lenovo Legion BoostStation (RTX 2060) over Thunderbolt 3.


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