Well, the anticipation of my new mac pro arriving has become so bad that I've resorted to spec-ing out the machine with my existing HDDs. I've got a total of eight HDDs, four of which I'm planning on sticking into the Mac Pro. The stock apple drive is a 250GB, 8MB cache drive (i seem to recall anyway). I have another SATA II, 250GB, 16MB cache drive as well. In the opinions of some of the very knowledgeable forum members, would it more beneficial to use the 16MB cache as the boot drive, or as the scratch drive? I've been debating whether or not the added performance would better suit the OS and it's components, or the aperture libraries, and PS and Final Cut scratches. Any thoughts?