This is an AM2+ motherboard.
Wish trumpeter1994 listed which Core 2 Quad.
Anandtech Bench (scroll down) Penom 9650 vs Core 2 Quad Q6600http://www.anandtech.com/bench/Product/23?vs=53
At this point a new motherboard/cpu may be in order, depending on whether yhe games you want to play are CPU or GPU dependent
Check out Tom's quarterly System Builder Marathon $500 and $1000 builds for results of different combinations of CPU/GPU performance.
Anandtech BENCH Phenom 9650 vs I3 3220http://www.anandtech.com/bench/Product/23?vs=677
Phenom 9650 vs G850http://www.anandtech.com/bench/Product/23?vs=404
Tom's Gaming CPU Guide is also very good
An AMD Build (should appear next marathon)
Phenom 9650 vs FX-6300http://www.anandtech.com/bench/Product/23?vs=699
GPU comparison 4850 vs 7770 (IE if $300 slit between MB/CPU/GPU/RAM)
Appears to show GPU upgrade and later CPU/MB/RAM is best choicehttp://www.anandtech.com/bench/Product/513?vs=536
4870 vs 7950http://www.anandtech.com/bench/Product/513?vs=550