Tried OCing my X800 XT and when running 3D apps at 520/520, it would randomly shutdown. So I had to bump up the AGP voltage to 1.6 from 1.55 and it seems to be running stable at 540/540. Is the 540 on the memory enough bandwith or is it bottlenecking the 540 core? I know this GC16 RAM is capable of 1200MHz, but I don't want to push it that much higher.