a64 3700 san diego
dfi sil-dr motherboard
kingstone ram
raptor hdd
xfx 6800gt
600watt psu

when using cpu intensive applicatiions and 3d instenstive applications my pc randomly shuts down

ive tried a new motherboard, ram, gpu, psu, hdds, remformatting, other cooling systems

but nothign seems to help

and ideas before i rma the cpu