Thunderbolt e-GPU shown as PCI-e 1.1 ×4

[XutaoZheng]

Hi, I'm Xutao ZHENG from China. I found a weird thing (I'm not sure whether it is a bug).

I have a external GPU connected to my thunderbolt dock. The GPU-Z says it is running on PCI-e 1.1 ×4 when idle and PCI-e 3.0 ×4 when rendering something (as shown below).



However, the HWiNFO64 says it always runs at PCI-e 1.1 ×4, whether rendering or not. I restart HWiNFO64 while rendering but it still shows PCI-e 1.1 ×4.



Then I tried the third party, the AIDA64 GPGPU test. The memory read and memory write results seems that PCI-e 3.0 ×4 (4 GByte/s theoretically) is correct.



Can you tell me the exact PCI-e version in my case? And why these softwares show different results? Thanks a lot.

Xutao

 

[Martin]

Information in the main window of HWiNFO doesn't update real-time. To monitor actual/changing parameters open the Sensors window.

 

[XutaoZheng]

Hi, Martin, thanks for your reply.

I noticed that so I tried to
① restart HWiNFO64 while running GPU-Z render test, but it still shows PCIe 1.1
② check the sensors window. I didn't find PCIe version but the PCIe speed is 2.5 GT/s (speed of PCIe 1.1)
So it still confused me.

 

[Martin]

If the PCIe device (GPU) is connected via multiple PCIe ports/bridges HWiNFO reports the current minimum PCIe link speed of each port in its path.