Freezing and Buzzing from monitor during gaming.

Graphics card(SAPPHIRE 7950 3GB with Boost) does not indicate any error, it never gets above 50C, there are no artifacts, and it runs smooth as butter when it works(Hitman Absolution and Shogun total war 2).

CPU doesn't overheat either, my NH-D14 keeps it(3930k) cool at below 50C at all times.

Fixes already tried:

Changing SATA cable on SSD
Reseating GPU/Power connections
reinstalling drivers/installing new drivers
updating BIOS
underclocking GPU.

Does anyone have any help?

There are no bluescreens, error codes, or anything of that sort, it freezes the frame and a loud buzzing comes from the monitor.

Games are all installed on the SSD(Intel 520 Cherryville 180GB)
Games ran through Steam
new build, used less than 5 hours, max.
After turning off the computer for a period of time, it'll let me play for 20-ish minutes, but then trying to reboot and play again results in near instant crash(2-5 minutes of play).

we need system specs also detailed PSU information

OK

CPU: i7-3930k
GPU: Sapphire 7950
RAM: Corsair Vengeance 1x8 LP
Motherboard:Intel DX79SI
PSU: Corsair CX750

+3.3V@25A, +5V@25A, +12V@62A, [email protected], +5VSB@3A

PSU specs

Have you tryed overclocking it the 2d partof the card there used to be a bug that the mhz on the 2d graphic side was to low and cause crash you might need to overclock it