New info guys,
The computer is still locking up even when I have crossfire disabled in "ATI Control Center" only way to get out is by doing a hard-reset.
More PC Info:
OS: Microsoft Windows 7 64bit
Processor: AMD Phenom II X4 @ 3.4GHz | 140w
Processor-cooler: Corsair H50
Motherboard: GIGABYTE GA-990FXA-UD5
RAM: 2x 4GB Corsair Vengeance 1600MHz CL9 1.5v
Graphic card: HIS Radeon HD6870 + XFX Radeon HD6870
Hard drive: Seagate 7200 250GB SATA + Extern Iomega 2TB
PSU: Corsair TX850w
Other Cooling: 5x120mm fan, one of them is an LED. 1x220mm LED fan
Temperatures: I logged an earlier crash today and the CPU was at 55C, GPU1 at 63C, GPU2 at 73C and HDD at 36C.
I had no crashes before I got my new motherboard, graphic card and RAM. I don't know if 850w is enough for this rig but that might be the problem?
I've also heard that Realtek can be a problem sometimes but I have a USB headset so it shouldn't really matter? I have not updated the BIOS or anything either.
I appreciate all answers, I'm starting to get a little desperate