gigabyte x800 xl 512mb video ram stops working as soon as it hits a certain temp
 

i just got a new x800 xl 512 gigabyte and as soon as it hits a certain temperature during games or even on ati tool the comp freezes

my stats are intel p4 3.00 ghts gigabyte duo pro motherbourd a gigatech 550whatt power supply sata 200gb harddrive x800 xl 512 graphics card and plenty of cooling