All sata HD's have an 8mb cache. Serial ATA drives do not have any gains in performance compared to ATA133 drives unless you go with the Western digital raptors that are 10K rpm drives but cost much more. If you need high performance go with raptors but they come in two flavors, 36.7gb and 74gb. The only advantage from ATA133 7200rpm drives and SATA 7200rpm drives is that cables are much smaller. You can get a 160gb sata 7200rpm with 8mb cache for less than $100 from newegg.com not including shipping.