Title says it all, here is my PC with it's current specs:
Refurbished: HP Pavilion H4A32AAR#ABA (P7-1436S) Desktop PC A6-Series APU A6-5400K (3.6GHz) 8GB DDR3 1TB HDD Windows 8 - Newegg.com
Stick a big over priced GFX card in there and go to town. Plenty of CPU and Ram in that PC.
That should play games pretty good as is....whats it not doing for you??