Josdekleijn
He already has that PC.
He wanted to upgrade not get a new one.
Also AMD CPU's and chipsets are just as reliable as Intel ones.
You don't need 8GB's. People go for 8GB just to be on the safe side. 4GB will do and people on LGA 1366 with 6GB's seem to be doing fine.
Eximo, A Phenom II X4 965 would only be a 20-30% upgrade. Not really worth it in my opinion.
The only Phenom II X6 you can find for a normal price right now is the 1045T which needs to be overclocked in order to really be an upgrade over that Athlon.
Your motherboard does no support FX CPU's, so you can't get the FX 6300.
Just overclock that Athlon and you should be fine.
Also get a decent graphics card.
A HD 7850 or GTX 650 TI Boost would be perfect.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814131473&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
http://www.newegg.com/Product/Product.aspx?Item=N82E16814162132&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
The HD 7850 gets a LOT of performance through overclocking while the GTX 650 Ti Boost is cheaper.
If you can spend a bit more, go for a GTX 660 Ti, GTX 760 or HD 7950 OC/Boost.
They are all pretty much evenly matched.
The GTX 660 Ti is the most power efficient but gains the least performance from overclocking.
The GTX 760 is the newest of all 3 and has some new NVidia features.
The HD 7950 uses the most power but is a champion overclocker and has the performance edge at high resolutions with high levels of AA.
http://us.ncix.com/products/?usaffiliateid=1000031504&sku=75685&vpn=GTX660%20TI-DC2O-2GD5&manufacture=ASUS&promoid=1337
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130938&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202026&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=