Evening. Back in 2010 I bought a Studio 540 to be used as my home computer. I use it for word processing and gaming. Gaming worked fairly well and out of the 200 games I've attempted to play the only two I've been unable to run at all were BF3 Beta and The Witcher 2. I can run Skyrim on medium with an acceptable framerate. I've recently saved up about $600 that I intend to spend on upgrading this computer to better run games. Specs are as follows.
OS: Windows 7 Home Premium
CPU: Intel Core 2 Quad CPU @ 2.50 ghz
RAM: 4 gb DDR2
GPU: 512 MB ATI Radeon 4350 HD
I'd like to upgrade my GPU. Ideally, I'd like to buy Nvidia. I've been looking at the GTX 580 and 560. I'll probably need a more powerful PSU as well to run aforementioned GPU. This is my first time upgrading a prebuilt machine. I originally bought this particular machine with the understanding that it is easily upgradeable. Suggestions?