hi, i have a AMD 64 3500+, 1gb of corsair XMS DDR memory, a gigabyte k8ns motherboard and an Ati X800 256mb graphics card. I looked in the bios and realised that my memory was only running at 166mhz and when i clock it up to 200mhz, every so often my screen will turn off then on again and a message saying Ati VPU reset. Has anyone else had this problem? Any help would be greatly appreciated.