RX480 stuck at 300MHz

suklee

On a couple of my rigs I've noticed the core/memory sliders greyed out on my RX480, with a single card hashing at 4.224Mh/s.



I've browsed through several pages of this forum and noticed a few people with similar issues but no concrete solution.

I've tried removing drivers (DDU) and reinstalling the cards 1 by 1 - once the problem surfaced (after the 4th card) it won't go away. The problem does not seem to be confined to a single card, i.e. I unplug what seems to be the culprit card, but after a reboot Wattman still shows one of the cards as greyed out.

Running out of ideas... help please?

Specs:
Asrock H61 BTC Pro w/ LGA1155 CPU & 4GB RAM
6x Powered risers, power supplied via Molex
Corsair RM1000i
Kingston 120GB SSD

dcsworld

Same as Suklee, had the same problem on the card plugged into the main pcie slot (via riser). The hdmi cable was plugged into card 2. Switched the cable over to the problem card and it fixed the issue!

MARETH2

Try to set this in your bios. I had the same problem an this solved it.

suklee

Thanks! I have it set on Gen1 currently for link speed. Will give it a try tomorrow (fingers crossed)

Truthchanter

I had this problem twice, and it seemed like randomly two different solutions worked each time. Like a previous post said, experiment with the pcie link speed in bios.

What fixed it for me most recently was reinstalling the driver (I didn't even unistall the driver first).

It would be great if you let us know which solution worked for you

Here's the topic about this i made yesterday: https://forum.ethereum.org/discussion/9482/fixed-problem-multi-480-rig-one-gpu-has-problem-doesnt-show-correctly-in-gpuz-and-only-4mhs#latest

suklee

MARETH2 said:

Try to set this in your bios. I had the same problem an this solved it.

No luck yet after changing to Gen2/iGPU monitor... now trying a reinstall of drivers on top of existing ones. (edit: still no change )

Truthchanter said:

I had this problem twice, and it seemed like randomly two different solutions worked each time. Like a previous post said, experiment with the pcie link speed in bios.

Yeah, on another rig I "fixed" this problem by plugging in a monitor! Totally random..

Logicaluser

I had this happen a couple times today on one rig, a partial fix is to disable and then re-enable each GPU in device manager, at which point the clocks get un-stuck

suklee

Logicaluser said:

I had this happen a couple times today on one rig, a partial fix is to disable and then re-enable each GPU in device manager, at which point the clocks get un-stuck

Tried but still no go.. disabled all RX480 in device manager, then re-enabled them one by one

suklee

Any other ideas to try?
I don't mind doing a clean format & reinstall but I'm afraid even after wasting an hour the problem will resurface.

suklee

dcsworld said:

Same as Suklee, had the same problem on the card plugged into the main pcie slot (via riser). The hdmi cable was plugged into card 2. Switched the cable over to the problem card and it fixed the issue!

Hmm .. this was the exact experience I had with another rig! I plugged in a monitor randomly and it magically fixed the "greyed out stuck at 300Mhz" problem. I just never made the connection to try different cards..

Edit: @dcsworld it worked! The 6th card is finally back in service after plugging in a monitor to the card on the MAIN (16x) PCIe slot!!!

ursul0

just posted my comment in the old thread...
https://forum.ethereum.org/discussion/9482/fixed-problem-multi-480-rig-one-gpu-has-problem-doesnt-show-correctly-in-gpuz-and-only-4mhs

Edit: sticking display into card on x16 (raiser in my case) also improves things, otherwise it may get lost sometimes during reboots.

brunojfk

Hello everyone, just for the record same thing here. It stopped after I removed any monitor plugs it and started accessing the rig using Teamviewer. Thanks!

allthesehorses

brunojfk said:

Hello everyone, just for the record same thing here. It stopped after I removed any monitor plugs it and started accessing the rig using Teamviewer. Thanks!

Thank you so much, I was having the same problem with mining ethereum using my r9 Nano. It was stuck at 300mhz & 8Mh/s no matter what I did, until I simply plugged my monitor in to the videocard now I'm at 24Mh/s and approximately 809MHz GPU core clock on gpu-z