I returned 2x256 PC3500 Hyper X because it wouldn't work well in this Mobo. It wouldn't do 195 stable no matter what I did. I just got my Corsair 2x256 PC3200C2 and it is running 205 FSB out of the box no problem with decent timings. Food for thought for you Version 2.0 guys. P.S. It's dual channel and synced 6/6