Hello! I wanted to build a Gaming PC to run games like Fallout, CS:GO, Cod 4, and Skyrim with ease on a 1366x768 monitor. I put together this build and I am ready to buy it but, I would like some second opinions on this build. Is everything compatible with one another? Also, I've had an extra copy of Windows XP Pro lying around for years. Rather than buying a new copy of Win 7, can I use XP and run this system just fine? Another thing, would I be able to overclock the cpu without getting an aftermarket fan with this setup?
You should go with TheBigTroll's build. It's better than the one you selected. You picked really cheap components. The motherboard was garbage.
Go with an APU with your budget, you get a good CPU and GPU in one die. The integrated is about as powerful as your 6670. You could probably drop down to 1866 or even 4GB of RAM and save some money. Is your Windows XP 64-bit? If not then you can't even use 4GB-8GB of RAM anyway.