Just yesterday, I was trying to find the max memory of my X800 Pro. ATITool went up to 561 and leveled off there for 2 hours so I know it is very stable. Today, when I went to play a game (atitool auto changes the frequency to my stable overclock), stripes appeared on the monitor. I immediately hit the reset button. When windows started up again, I went to find max core, and it stopped at 456. What happened? Is my video card dying? My core can still run at 624 without problems. It's only when I raise the memory.