I have purchased and mounted a powercolor hd 5850 pcs+ after changing the same with my 4650. It looks great card stays fine and seems very cool (have only moved up to 58C with furmark) but I am unable to get this past 875/1150 (gpu/mem clocks).
I initially tried to go with the MSI afterburner , configured the cfg and enabled unofficial clocking and switched on the voltage control and monitoring but I still getting unable to change the voltage via afterburner so it seems unstable whenever I push it past 900/1150.
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