Hi all,
I have a Gigabyte Radeon RX Vega 64 GAMING OC 8GB and I have been playing w=
ith
undervolting/overclocking the card for a better performance/power draw rati=
o.
I have set the voltages/frequency as follows:
https://gist.github.com/Bednar87/eeeee4fea34b03b96b2833e2900d3405 wi=
th voltage
capped @ 950V
Now of course prior to doing that I added the amdgpu.ppffeaturemask paramet=
er
to the boot line with value 0xfffd7fff.
Looking at sudo watch -n 0.5 cat /sys/kernel/debug/dri/0/amdgpu_pm_info sho=
ws
that the voltage is at 1200mV (VDDGFX). The power draw is also not reduced =
as
one could expect from undervolting the clocks but instead shoots up to 320W=
and
maintains this value under stress (50% power limit was also enabled).=20
The frequency on the clocks seems to work fine and the settings seem to be
honoured but the voltage value seems to be ignored.
cat /sys/class/drm/card0/device/pp_od_clk_voltage
OD_SCLK:
0: 852Mhz 800mV
1: 991Mhz 825mV
2: 1084Mhz 850mV
3: 1138Mhz 875mV
4: 1250Mhz 900mV
5: 1370Mhz 925mV
6: 1475Mhz 950mV
7: 1575Mhz 950mV
OD_MCLK:
0: 167Mhz 800mV
1: 500Mhz 825mV
2: 800Mhz 865mV
3: 1050Mhz 950mV
OD_RANGE:
SCLK: 852MHz 2400MHz
MCLK: 167MHz 1500MHz
VDDC: 800mV 1200mV
I am on Arch Linux kernel 5.0.6 MESA 19.0.1