I've use the gfx card XFX geforce 6600gt 128mb ddr3, for two days. the computer goes blank when i run games at high settings. my smps power is 300w. it seems that temp. is the culprit, as it does not happen during q3a or doom 3 but during games like nfs ug, seriuos sam and painkiller. what do i do? the temp. shown in nvidia properties is 51-52 when i checked it during nfs ug. what is limit for the temp. of gfx card?