Q: Also, 2GB of RAM and a 500GB hard drive if that matters. Specifically, I have this PSU: http://www.newegg.com/Product/Product.aspx?Item=N82E16817103942
A: A quality 430 watt power supply should be enough for that system, unless there are things about it you aren't mentioning. You can use this power supply calculator to get an estimate of your system's power consumption: http://extreme.outervision.com/PSUEngine That graphics card is not particularly power-hungry.