I have 4x2gb memory as stated in my signature (work in progress). It looks like I hit a wall at 3.6GHz on the CPU. I tried bumping the CPU voltage to 1.6V but when I get to 3.7GHz on the CPU, Vista will blue screen during boot. I suspect this has something to do with the fact that I am using 4x2gb memory. I tried ganged and unganged... I really expected to hit 4GHz with this system considering the water cooling and all. I had the 9850BE running on this rig at a clean 3.0GHz, any attempt to go higher would fail even with ACC enabled. Any suggestions other than go down to 4GB memory and see what happens? Still, happy with the CPU, would like to push it some more...