Be aware: I tried some Kingston Hyper X on my Shuttle AN35N-U and that was a no go!!! Shuttle even admits that they have probs with the Kingston Hyper X. I don't know how it is with the cas 3 (which is quite bad I IMHO) but I'd be very much for taking the OCZ. Most of the ppl I know with AN35N-U have taken either TwinMOS or Buffalo (all with Winbond CH-5)