Vista x64 BSOD issues when gaming

Firstly my computer is kick a*s, it's got an amd 9950 black edition quad-core cpu, 4gigs of ballistix ram 1066mhz, a sweet nvidia 9800gt gfx card and a gigabyte ma78gm-s2h mobo.

However, recently the damn thing has started randomly crashing (in true windows BSOD style) when playing games. The first few times it happened i thought nothing of it but its started happening within 15mins of starting any graphically intensive game, i should also mention that's its almost certainly not a overheating issue, i keep 3 fans on the cpu (the main one on top and then two either side) and the thing stays damn cool and the custom heatsink for my gfx card (that i ripped off an old 939 cpu) keeps it at 49-54 degrees.

The error messages that the BSOD gives are SYSTEM_SERVICE_EXCEPTION and occasionally IRQ_NOT_OR_LESS_EQUAL or something like that. Also the computer stays completely stable when not running games.

So, anyone have any ideas what causing this?

BSOD's are usually caused by hardware or driver failure try updating all the drivers first and see if that will help if no it maybe caused by some hardware part in most cases its ram or HDD.

thanks for the quick reply gonna try doing that now.

I know nothing about this but do you have SP2?