An SATA II with 16mb cache(non- Raptor) or an SATA 150 Raptor with 16mb cache. I do alot of gaming and Im about to rebuild my machine with Epox SLI board and 7900GT video. The mobo supports SATA II. The SATA II Raptors are too expensive. Newegg has an SATA II Western Digital 250GB for $79 after rebate and a 75GB Raptor with 16mb cache for $140 after rebate.