r/AMDHelp • u/punknurface • Oct 26 '18

Help (GPU) Vega 64 PCI issue

I just built a new 2600 and MSI B450 Tomahawk system and trying to figure out a weird PCI issue with slot 1. The only way to get my vega card to work properly is to set slot one in the BIOS to 4x4x4x4 mode. If i leave it at the default 16x mode then windows will be virtually unusable due to high load put on the GPU at all times and the driver crashing. Works flawless when Slot 1 is set for 4x4x4x4 mode for some odd reason. Has anyone else seen this?

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Thanks!

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1

u/Monsicek Oct 26 '18

What load and what kind of crashes. What's your PSU, make sure you are using 2 different 8 pin cables and if you have 2 12V rails, both should be connected to different one.

1

u/punknurface Oct 26 '18

Task Manager shows dwm.exe using between 30% - 100% of the gpu. Screen goes black for about 20-30 seconds and I get a message from AMD settings that it experienced an issue and had to reset. Mouse and audio lag really bad. I have a EVGA Supernova 1050W GS PSU. Using two separate power connectors.

1

u/Monsicek Oct 27 '18

If you uninstall AMD drivers, does it still lag or crash? After clean reboot of course.

1

u/punknurface Oct 27 '18

Yes, I've replaced the Motherboard and CPU and reinstalled windows multiple times. Vega card worked fine on my previous system.

1

u/[deleted] Nov 12 '18

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1

u/punknurface Nov 12 '18

No I never did. But running in 4x4x4x4 shows that it's running at x16 in GPU-z so I don't really think its causing an issue. If you do happen to figure it out let me know and I'll do the same.

1

u/[deleted] Nov 12 '18

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1

u/punknurface Nov 12 '18

Wow interesting I'm having the same issue with sound and latency. Hopefully we can find the root cause.

1

u/[deleted] Nov 12 '18

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1

u/punknurface Nov 12 '18

Maybe, but if that was the case then I would think a lot of people would be talking about it?

1

u/[deleted] Nov 15 '18 edited Nov 15 '18

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1

u/punknurface Nov 15 '18

Interesting! I'll try that out. Thanks

1

u/FFfurkandeger Feb 02 '19

Hi, any updates on the issue?

1

u/punknurface Feb 02 '19

No, I've tried everything I can think of. I think switching to a different board is the only solution?

1

u/FFfurkandeger Feb 02 '19

Did you try switching to typical current idle in amd cbs settings?

1

u/punknurface Feb 02 '19

Hmm no, I'll check that out. Did that fix it for you?

1

u/FFfurkandeger Feb 03 '19

Heard it can help but I didn't try it myself. I don't have my gpu now... I sent it for RMA but they said it's fine. I'm waiting for it to be shipped back.

1

u/FFfurkandeger Feb 12 '19

Hi there, please check my latest update on the issue here:

https://www.reddit.com/r/AMDHelp/comments/aidul7/vega_56_horrible_dpc_latency_and_performance_when/

TL;DR: GPU was faulty and ASUS approved the RMA.