Be careful. This company sent me standard 40 pin ATA33 cables when the web site and invoice said ATA133. Just for the sake of arguement I benchmarked them and they were in fact ATA33. I called them up and they said "Our engineers tested them...blah, blah blah). I had it sitting next to a real ATA133 round cable and the difference was obvious. They said send it back for a refund but I'll take the $16.oo hit and get my stuff elsewhere.