The memory clock might be measured differently — base clock speed vs "effective" memory clock. Anyway my 6600 running Furmark also says 875 and does about 92 fps without trying to optimize anything.
I see. So nothing to worry about I guess. Thanks.
Sadly, AMD's Linux drivers are notorious for having trouble adjusting the clock speed. You may need to manually set the card to the highest speed before starting the test.
Isn't AMD's proprietary drivers horrible on Linux too? Anyway, I can set the clocks to highest on LACT, but for some reason Furmark still shows 875 MHz (3.5 Gbps).
IIRC proprietary driver doesn't contain kernel component, it runs using Linux's standard amdgpu driver (and it's the kernel driver that handles power management and stuff). And I don't think it's terrible, there is just not much point to it since Mesa is good enough (and Valve also promotes using Mesa).
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