Upgrading my graphics card?

[Brosive]

Just make sure your powersupply can handle it and that it doesn't conflict with your motherboard. Generally, you won't know this until you actually plug it in or research around the internet. I think your computer can handle it. GTX 660 might be a bit of a jump. Depends on the vram version you get. If you get the 6 gb of vram, version, then your powersupply should be over 800 watts (counting in RAM, processor, motherboard, disc drives, etc.), I'd assume.

Vram means video ram right?