Computer shutting down during MP

I am having the same problem. Everything seems to work fine, but my computer will reboot randomly. I only have this problem with this game and I can run most games on ultra settings. Specifically, the game will run fine for periods of time ranging from 15 minutes to 45 minutes, then the computer suddenly turns off and boots up again. 

Originally, I thought the issue was with the RAM as I recently purchased new RAM just for bf4. However, I did not have this problem during the beta and the RAM was installed in my computer at that time. So I doubt it is an issue with the memory. I am running memtest 86 right now to make sure.

I have checked to make sure that there are no temperature problems. I am using the newest nvidia driver 331.65. Again, I can play any other game right now just fine. 

I have posted my specs below. Sorry, don't have access to computer while running memtest.

Very frustrating because I cannot play the game as I can rarely finish a match. I am worried that it is an issue with the power supply. Let me know if there is any other information I can provide. Please help!!!

PC Specs

OS: Windows 7 64 bit

Motherboard: Intel BOXDX58OG LGA 1366 Intel X58 SATA 6Gb/s USB 3.0 ATX Intel Motherboard

Processor: Intel Core i7-950 Bloomfield 3.06GHz LGA 1366 130W Quad-Core Processor BX80601950 (8MB L3 Cache) (4 x 256KB L2 Cache)

Graphics Card: EVGA 03G-P3-1584-AR GeForce GTX 580 (Fermi) 3GB 384-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card (3GB 384-bit GDDR5)

Power Supply: CORSAIR TX Series CMPSU-750TX 750W (ATX12V v2.3)

RAM:  1) CORSAIR Vengeance 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 2000 (PC3 16000)

            2) G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)