Just quick report before going to bed (long day tomorrow )!

Sapphire default GPU Vcore is 1.125V load
not good enough for 960MHz core in FureMark (freezes after 30+sec.)
upping vGPU to 1.185V is enough for stable 1GHz on core! Haven't had time to try higher clocks on this voltage yet. It will need to wait till tomorrow!

BTW 9500 oMarks is easy with this card


@okorop: Afterburner works fine on Sapphire HD5870 which should mean it will work on any reference HD5870