That HP has plenty of processor for Diablo 3.
If you have to get a new power supply, i would get ...
An Asus DCII GTX 560 for $190 --> http://www.newegg.com/Product/Product.aspx?Item=N82E16814121446
A CORSAIR Builder Series CX600 V2 600W for $70 --> http://www.newegg.com/Product/Product.aspx?Item=N82E16817139028
Comes to $260 total.
(You could get a GTX 560 SE, and drop your total to $200)( Getting off topic, but microcenter sells a PC for $230...that can play Diablo 3? I know you have a serious misconception here, or i misunderstood what you were saying. lol, found what a $230 dollar Microcenter PC looks like --> http://www.microcenter.com/single_product_results.phtml?product_id=0388110. A GeForce 6150 SE is just enough GPU power to play solitaire without lag...lol I would like to see a link to this $230 PC. My video card from 7 years ago was faster... and that is no exaggeration, that is a literal fact. )Edited by crimsontears809739 - 5/1/12 at 6:18pm