Question guys, Had no problem OCing HD6850 in past, stock 830/1100 been running at 950/1150 for gaming. OCing with afterburner, though the problem seems to happen in TRIXX as well. Noticed flickering when reseting back to default values, or running with powerplay enabled, though I was getting artefacting, though realised last night that what is happening is the mem speed is no longer locked after reset, and is dropping to 150/100 and I guess switching with powerplay, hence flicker everytime there is a change in mem speed. Reset machine, and everything fine i.e powerplay running fine with 300/1100 600/1100 and 830/1100. Soon as I OC then mem starts switching again. Any advice.