FYI I've read thhat the SS4200's support the Intel Core 2 Duo E4xxx CPUs as well, such as E4300 - E4600. I personally bought an E4400 but have not popped it in to test it yet. Mine is still running on the stock Celeron single-core 1.6GHz but upgraded to 2GB of RAM. I'm running Windows Home Server on mine with mismatched (different brands) 1.5TB drives.