From what I have read, they are not as fast as they are cracked up to be. Check Barefeats.com for tests. If you want SUPER speed, go with an SSD--something like a Vertex 2 SATA II SSD drive. They are coming down in price now that the Vertex 3 SATA III SSD drives are out. Your HD bus is running at 3Gb/s, so no need to spend extra money for a SATA III drive.