Looks like driver error, when did you last update your drivers for your motherboard, soundcard and graphics card.
Other than that it could only be that the PSU isn't giving enough power.
HAF 932 -- ASUS P8Z68-V
Intel i5 @ 4.5Ghz -- CoolerMaster Hyper 212 Plus
8GB Corsair Vengeance Jet Black 1600MHz -- 2x XFX ATi Radeon HD 6970 2GB