Pretty sure i did that already. Turned an Atlhon 2 x2 into a gaming rig
Had an Atlhon 2 x2 and replaced that with a Phenom 2 x6
GT 240 replaced by a GTS450 before being replaced by a GTX680
2GB of DDR2 RAM and now has 8GB
It was definitely a fun project to take a potato and turn it into a gaming rig.