Trying The Experimental Radeon RX 480 Overclocking With AMDGPU OverDrive Isn't Going So Well

[phoronix]

Phoronix: Trying The Experimental Radeon RX 480 Overclocking With AMDGPU OverDrive Isn't Going So Well

With the Linux 4.8 kernel coming later this year one of the main end-user additions to the AMDGPU kernel driver is GPU overclocking support via OverDrive. This is the first time AMD GPU overclocking is being offered via their open-source Linux driver and so I decided to try it out with the AMD Radeon RX 480 using this experimental DRM-Next code.

http://www.phoronix.com/vr.php?view=23349

[Taisserroots]

Try undervolting the card and increasing the power limit.
Other reviewers have found the card is power limited and at boost clocks throttles. Some have noted that by increasing fan speed and undervolting by a small amount, they were able to prevent throttling and maintain a higher fps

[CrystalGamma]

You should consider yourself lucky you even got this working without OC :P When I put my RX480 into my system, I don't even get the display running, while getting the same voltage errors as here (I can only see them in the journal after rebooting with a different card/system, obviously). And yes, I used git builds of linux, linux-firmware, libdrm and mesa, as well as a SVN build of LLVM. Did I miss something?

[anolting]

Maybe the instability is forced by the fact that the RX 480 does consume to much power from peg slot

[smitty3268]

Maybe the instability is forced by the fact that the RX 480 does consume to much power from peg slot

If that were true it should be affected on Windows the same way.

[bug77]

If that were true it should be affected on Windows the same way.

Not if the Windows and Linux drivers don't check the same things and limits.

[mibo]

Maybe the instability is forced by the fact that the RX 480 does consume to much power from peg slot

This is nonsense.
The PCIe slot current for 12V could become an issue when powering more than two rx480 in one mainboard (and the problem would be the current through the 24pin ATX power connector).


Is it correct, that one can not change the power limit and voltages? That would be quiet limiting for the overclocking.

[juno]

Try undervolting the card and increasing the power limit.

BIOS modding is a too high barrier for such a test. We don't have WattMan on Linux...

[Taisserroots]

BIOS modding is a too high barrier for such a test. We don't have WattMan on Linux...

Oh right

[anolting]

This is nonsense.
The PCIe slot current for 12V could become an issue when powering more than two rx480 in one mainboard (and the problem would be the current through the 24pin ATX power connector).


Is it correct, that one can not change the power limit and voltages? That would be quiet limiting for the overclocking.

Sorry this not nonsense. The rx 480 takes an average of 83 up 88 watts which is more than specified for PC I express. Overcloking can destabilize the main board which can lead to instability at all.