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PC Processors

WarLizard
Journeyman III
‎03-01-2023 12:20 PM

5900x - GPU operating x8, not x16

I've already made posts on Reddit, have performed countless troubleshooting steps, and finally created a support ticket with Gigabyte for my MOBO.  Gigabyte's response was "Since the PCIe lane is controlled by the CPU, we suspect it's the CPU itself.  Check with AMD if they can offer any sort of utility to testing the CPU."  Gigabyte could very well be correct, it might be the CPU, but AMD to my knowledge does not provide software for testing hardware.  All of that is in-house and proprietary.  So what am I left to do?  Just RMA the CPU and hope that fixes it?

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3 Replies
misterj
Big Boss
‎03-01-2023 03:09 PM

WarLizard, you have presented no information. Please post all you system components and OS. Also post evidence of what you are complaining about. You can contact AMD Support here. Thanks and enjoy, John.

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WarLizard
In response to misterj
Journeyman III
‎03-01-2023 04:52 PM

5900x, x570 Aorus Master, RTX 4090, 980Pro Nvme drive, PEXUSB312A2C2V USB add-in card, Seasonic PX Prime 1300w PSU.

Both GPUz and 3Dmark PCIe bandwidth test indicate GPU is running x8, placing a load on the PCIE lanes does not dynamically change number of lanes used - it stays at x8.  Completely cold boot, such as being off for an hour or more, will sometimes boot the GPU as x16 but if I restart the computer for any reason it switches back to x8.  USB add-in card is also only running x2 and not x4. 

GPU and NVMe are both in their first slots, respectively.  Both of which go to the CPU and use 20 lanes of PCIe.  USB add-in card uses the last slot which goes through the chipset and should use all 4 available lanes, but only uses 2.

I've tried reseating the processor, resetting the BIOS, updating the BIOS, removing the USB add-in card, nothing works. For some reason if I force the MOBO to use PCIE gen 3 the card will run x16 - only on Gen 4 does it exhibit this behavior.

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misterj
In response to WarLizard
Big Boss
‎03-01-2023 05:45 PM

WarLizard, has your performance suffered? Please post a screenshot of GPU-Z and notice their comment about their PCIe speed report. Also please post screenshots both Basic and Advanced of Ryzen Master (RM) running Cinebench R23. If you have installed applications from your MB vendor please remove it as well as any third party utilities. Thanks and enjoy, John.

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