AMD GPU overclocking

vikingtons , 6 months ago

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?)

MoreCoffee OP , 6 months ago

Windows:

<span style="color:#323232;">mclk: 2650
</span><span style="color:#323232;">clk: 3000
</span><span style="color:#323232;">voltage: 1020
</span><span style="color:#323232;">power limit: 15%
</span>

Linux LACT settings:

<span style="color:#323232;">mclk: 1325
</span><span style="color:#323232;">clk: 3000
</span><span style="color:#323232;">voltage offset: -80
</span><span style="color:#323232;">power limit: 333w
</span>

It’s a powercolor hellhound 7900xt.

<span style="color:#323232;">> cat pp_od_clk_voltage 
</span><span style="color:#323232;">OD_SCLK:
</span><span style="color:#323232;">0: 500Mhz
</span><span style="color:#323232;">1: 2815Mhz
</span><span style="color:#323232;">OD_MCLK:
</span><span style="color:#323232;">0: 97Mhz
</span><span style="color:#323232;">1: 1250MHz
</span><span style="color:#323232;">OD_VDDGFX_OFFSET:
</span><span style="color:#323232;">0mV
</span><span style="color:#323232;">OD_RANGE:
</span><span style="color:#323232;">SCLK:     500Mhz       5000Mhz
</span><span style="color:#323232;">MCLK:      97Mhz       1500Mhz
</span><span style="color:#323232;">VDDGFX_OFFSET:    -450mv          0mv
</span>

vikingtons , 6 months ago

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.

MoreCoffee OP , 6 months ago

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.

vikingtons , 6 months ago

How far are you able to take mclk in Fedora without any voltage offset?

Does 1020 mV pass Vulkan memory test in Windows?

MoreCoffee OP , 6 months ago

Basically no increase with default voltage either. If I bump mclk +10 it starts to flicker. Set it back to 1250 and no more flickering. I will have to test that on windows when I get some time.

vikingtons , 6 months ago

huh, interesting. is the flickering like an intermittent white flash?

Also - sounds good.

MoreCoffee OP , 6 months ago

I just tested memtest_vulkan on linux, everything default but set Mclk to 1300, and it passed. But, there was still some flickering, not non-stop, but every once in a while I would get a flicker.

vikingtons , 6 months ago

Is this with a single display? Do you think you could capture a video of this flicker?

MoreCoffee OP , 6 months ago

I’ve got 3 displays. I just noticed something interesting; if I apply my settings in LACT I notice some flicker, if I then logout of my gnome session and relogin it seems fine, no flickering yet. I’ll do some more testing.

Helix , 6 months ago

Try the program [CoreCtrl](https://gitlab.com/corectrl/corectrl), IMHO it works quite well and is easy to use.

lemba , 6 months ago

@Helix @MoreCoffee Been using #CoreCtrl a few months now and gotta say, it's very nice and gets the job done.