I wasn't too surprised when I didn't get any REAL boost when I got my 133 setup. I was using a promise Ultra 66 card. Seems like my biggest kick in the pants was when I went from my 33 to 66 with a 7200 RPM drive. Depending on what you're starting with, I might suggest saving the money on the 133 card and loading up with an excessive amount of RAM if the system is primarily for gaming...