Vashyo on 20 November 2009
AM3 processor is useless on AM2+ motherboard you would just be throwing money away, so I'd say go with a budget AM2+ processor preferably X4 phenom if your nvidia graphics card is powerful.
I'd suggest something like AMD Phenom X4 940 3,00 GHZ for it's price and it has good clockability if you want to squeeze more power out of it later, it's a great processor for the AM2+ socket.
