Re: Computer rebooting issue
I also doubt it's the CPU, but the memory is definitely suspect. Test a stick at a time with memtest86+, or if you have a set of memory of known quality, and functionality, replace the current memory with it, and see what happens.
HAF 932 Advanced / Corsair AX1200 / Asus Rampage IV Extreme / i7-3930K / H100 Cooling 4x120mm
16GB Corsair DDR3 / GTX 580x2 SLI + GTX 460 PhysX / SSDs Mushkin 240GB, Crucial 256GB, Crucial 512GB