The Gaming computer I built is Freezing (NEED HELP Please!!!!)

Months ago my sort of dream computer was built, it was working fine until my video card (XFX 5850 Black Edition) went defective on me. Ever since then its been a nightmare. When it went defective I RMA it. i thought problem solved but ever sinced then my video cards were constantly on becoming defective so after the 2nd RMA they sent me a different one (XFX 6870), by that time I was fed up and bought a different one (Asus EAH 5850) thinking that when they would send me a good card so I could crossfire it. So to speed things up my PC freezes on me 5-10mins whether I'm gaming or not. I am open to any suggestions. Note: Both video cards work fine. I bought cheap memory sadly because it was getting kind of getting expensive (I also did a memtest86 but only one works) but I bought some corsair vengeance I also bought a new mother board because I was told it was defective. I can't even update because of freezes, is it the motherboard or power supply...?? Please Help. I don't know anymore options.

PC Specs:

CPU: AMD X6 1090T 3.2 GHz, 3.6 GHz turbo-core/

CPU Cooling: ECO A.L.C by Coolit

Video Card: XFX 6870/--

Hard drive: Western Digital Caviar Black 1/TB 6gb/--

Power Supply: Corsair 750 watt/--

Motherboard(currently in my computer) Asus M4A89GTD PRO/USB3--

Motherboard (New one currently on standby) Gigabyte 880GA-UAD3H/--

Memory: (1) Patriot Sector 7(Currently in use)

Memory: Corsair Vengeance( New one currently on standby)---

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