Random freezes plaguing my new comp. Please help! =)

(If this is posted in the wrong forum, I apologize.)

I built this sytem around a month ago and it's given me nothing but issues. They system will randomly freeze. The time before they system locks up is random, could be a minutes, could be an hour. It happens whether I'm gaming, surfing, chatting, updating Windows, anything. Yet, they system can go through 10 hours of Prime95 without errors and survive all stages (except Xtreme Stress mode) of the Intel Burn Test.

I've returned the original motherboard, processor, and memory to try and root out the problem. I did an update installation of Windows 7 to see if that would help. I've also scoured the internet trying to find a solution, but I'm still having this issue. I just want to use the system I spent my hard-earned money on.   Any help would be appriciated! =D




System specs:

Mobo: ASRock 870 EXTREME3 AM3 AMD 870 SATA 6Gb/s USB 3.0 ATX AMD Motherboard
CPU: AMD Phenom II X4 955 Black Edition Deneb 3.2GHz Socket AM3 125W Quad-Core Processor HDZ955FBGMBOX
RAM: G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBRL
PSU: OCZ ModXStream Pro 700W Modular High Performance Power Supply
HDD:Seagate Barracuda ST31000524AS 1TB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive
CD drive: ASUS DRW-24B1ST/BLK/B/AS Black SATA 24X DVD Burner
Heatsink: Cooler Master Hyper 212+ in push/pull config
OS: Windows 7 Ultimate 64-bit

BIOS settings:

CPU: 3800 Mhz
CPU voltage: 1.4250
NB frequency: 2800 Mhz
NB voltage: 1.3250
HT Bus Speed: 2600 Mhz
HT Bus width: 16 bit

Memory clock: 800 Mhz DDR3 1600
DRAM voltage: 1.603v

HT voltage: 1.240v
mGPU voltage: 1.141v
SB voltage: 1.10v
CPU VPPA voltage: 2.54v
PCIE VPPA voltage: 1.181v

P.S.- The system is overclocked because I read that AMD processors have an issue with some types of ram and doing that will solve it. They system also did this at stock settings. The RAM is overvolted because I couldn't get it even barely stay in Windows without doing so.