So I have this casual use computer I bought from a PC Richards store about 2-4 years ago. It's nothing special at all and I've been trying to upgrade it with better computer parts to make it at least a decent gaming computer. First I bought it a new graphics card, an Nvidia Geforce 9500 GT and a 500 watt psu. Worked perfectly and I could play games with a little bit better graphics, but still not at a level that I was satisfied with. So I went out and bought a better graphics card, A Geforce GTX 550Ti, but my computer still had trouble running games on really high settings. So I went out and tried to buy a new cpu for it, an amd phenom II 560 black edition, but my motherboard has an AM2 socket and the cpu I bought needs AM3. So now I need to buy a new motherboard for this computer, one that's compatible with all the parts I already own, but I'm not too sure what would be right. If anyone could recommend me something I'd really appreciate it.