Wanted to replace an Athlon 64 3500+ with Athlon x4 630 on a N68-gs which does support am3 socket cpu-s but has 2 slots of ddr2 (max)1066 mhz memory. I'm currently using 2x2gb of 667 mhz ones and a seller on amazon said "it's not compatible since this is a ddr3 chip". I checked on asrock's cpu support list and this cpu is listed there. If anyone has more info that would be appreciated.