PCBuild; random restarting, freezing, crashing; help?

Hello, Majorgeeks.

I recently assembled a computer for gaming, but it keeps randomly restarting, randomly freezing, and that such.

I have tried most every solution I have been able to find by Googling, but to no use.

The computer will restart at random, most often four to six minutes after starting, and entering Windows, or it will freeze, or a buzzing sound will emit from the speakers and it freezes at the same time.
I'm unable to play /any/ games; it's literally unplayable. I have become so frustrated with this.
I was able to play Arma II for five minutes last night, it was amazing, but then it froze, and I was forced to manually force-restart it using the button on the case.
Beforehand, I was unable to enter any games without an instant random restart, but I upped the CPU power slightly, which seemed to help. I'm not sure if it's a coincidence or what.
I'm not sure if this is a hardware issue, a power issue, or what. I was hoping I could find help here as to what may be causing the issue.

I never encounter a blue-screen, or have an error to go with the crash, freeze, or restart. It's really confusing, and really frustrating..

Here are my PC specifications.





Computer specifications
Operating System: Microsoft Windows 7 Home Premium SP1 64-bit - OEM
Motherboard: ASUS M5A97 LE R2.0 AM3+ AMD 970 SATA 6Gb/s USB 3.0 ATX AMD Motherboard with UEFI BIOS
Power Supply Unit (PSU): Rosewill CAPSTONE Series CAPSTONE-750 750W Continuous @ 50°C, 80 PLUS GOLD Certified, Single +12V Rail, ATX12V v2.31 / EPS12V v2.92, SLI Ready, CrossFire Ready, Active - PFC Power Supply
CD Drive: LITE-ON DVD Burner - Bulk 24X DVD+R 8X DVD+RW 12X DVD+R DL 24X DVD-R 6X DVD-RW 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM Black SATA Model iHAS124-04 - OEM
Hard Drive: Western Digital WD VelociRaptor WD3000HLHX 300GB 10000 RPM 32MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive
Ram (DDR3): Crucial Ballistix Sport 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model BLS2KIT4G3D1609DS1S00
Central Processing Unit (CPU): AMD FX-4300 Vishera 3.8GHz (4.0GHz) Socket AM3+ 95W Quad-Core Desktop Processor FD4300WMHKBOX
Video Card: MSI R7950 Twin Frozr 3GD5/OC Radeon HD 7950 3GB 384-bit GDDR5 PCI Express 3.0 x16 HDCP Ready CrossFireX Support Video Card
Case: Antec Eleven Hundred Black Super Mid Tower Computer Case

BIOS Settings; voltage
CPU MANUAL Voltage: 1.476V
CPU/NB MANUAL Voltage 1.400V
CPU VDDA Voltage: 2.523V
DRAM Voltage: 1.500V
NB Voltage: 1.150V
NB HT Voltage 1.223V
NB 1.8 Voltage: 1.800V
SB Voltage: 1.100V

BIOS Settings; configuration
CPU Ratio: Auto
AMD Turbo Core Technology: Disabled
CPU BUS Frequency: 200
PCIE: Auto (Can be set between 100 - 150)
Memory Frequency: DDR3-1600MHz

BIOS Settings; monitoring
CPU Temperature: +44.C / 111.F
MB Temperature: +31C / 87.F



Are my voltage settings set correctly? I'm not overclocking, and do not wish to overclock.
I very much appreciate any help that is given. Thank you.