I’ve been messing around with overclocking my 7900xt on linux to see if I can use the same settings as I do on windows. Unfortunately, it doesn’t seem nearly as stable on linux. For some reason adjusting the memory clock by about any amount causes a lot of screen flickering. Has anyone had much success overclocking their AMD gpu with the same settings as on windows? I’m running wayland, kernel 6.7.1 with a drm patch fo fix setting power level. Using LACT to do the overclock.
What are you attempting to set mclk /voltage to, and what are you using on Windows? (If you’re uaing an AIB model GPU, could I also get the OOTB settings as well?)
Windows:
mclk: 2650
clk: 3000
voltage: 1020
power limit: 15%
Linux LACT settings:
mclk: 1325
clk: 3000
voltage offset: -80
power limit: 333w
It’s a powercolor hellhound 7900xt.
> cat pp_od_clk_voltage
OD_SCLK:
0: 500Mhz
1: 2815Mhz
OD_MCLK:
0: 97Mhz
1: 1250MHz
OD_VDDGFX_OFFSET:
0mV
OD_RANGE:
SCLK: 500Mhz 5000Mhz
MCLK: 97Mhz 1500Mhz
VDDGFX_OFFSET: -450mv 0mv
Could you tell us which distro + mesa? If I understand correctly, your state 1 mclk of 2500 MHz is stable on Linux, but pushing it to 2650 (as set on Windows) causes instability?
If so, could you tell us which Adrenalin version you’re using? The voltage floor for NV31 has sort of shifted since release; several users have found that their previously stable OC’s will no longer pass vulkan memory test (for example) on 23.20 and newer. Seems to be particularly noticable with AIB models as they can have substantially higher clocks than MBA ASICs.
Fedora 39 + Mesa 23.3.2. Yea, the mclk is stable at 2500mhz default and even increasing it say 50mhz seems to cause flickering, that will sometimes go away then come back. Adrenaline version is latest, 23.12.1.
