7nnxvp on board igp

Hi all
Has anyone with this board had any problems with the onboard vga???
when i try to run any 3d apps the screen is full of lines and artifacs,
until it locks up.
ive tried lots of different drivers, fresh installs of xp with each driver
i have an enermax 465watt psu so i dont think its that,
my ram is matched pairs of samsung.
ive tried dual and single channel, and one single stick
ive swapped the cpu from 3000xp and 1800xp
im not sure what else to try..
many thanks
anti