This is your CPU, correct? Single core...sheesh, didn't know they still made em. http://www.newegg.com/Product/Product.aspx?Item=N82E16819103239&cm_re=le_1640-_-19-103-239-_-Product It is a Socket AM2 processor, which means your motherboard is Socket AM2. You cannot get a Phenom II x4 because they are socket AM3. Scooting around newegg here, I only see AM2+ quad core available :( Wow, looks like they totally cleaned their stock out of AM2 dual cores too....sheesh. Your motherboard also supports DDR2 RAM. DDR3 is the new stuff about, so you will be paying a fair chunk of money for it now because they don't make it anymore. Pretty much, you'd have to get a new motherboard...sorry.