I have a upgraded sawtooth G4 450 to a G4 1.5Ghz OWC extreme and 2.0GB of RAM Now, I need to add the fastest hard drive controller, and adaptec 29160 is not it. with a 15K RPM drive. So, what is? and last, was is the fastest video card, that I can ran with 4 hd drives, and dvd & zip. Thanks - Richard