your sig says 5870, and is your 4890 stable in games? you don't get restarts or graphic crash then bsod!!? if it is stable do share your method?
Yep ive sold it now but it was stable i used software to get the core to 1.32 (i think) and bios modded it up to those speeds

benched with my [email protected] and was scoring 9800ish in 3dmark vantage