I have been reading around trying to figure out what would be the best scratch disk for me. I read somewhere that RAM is the fastest. I will have 32GB, will that cover me, so I won't need a different scratch disk? Then I read SSD, but that they can get worn out quickly as a scratch. Then I read that RAID 0 7200rpm drives are super fast as well. I am hoping to either use a 640gb 7200rpm drive that came with the Mac Pro, or maybe just let it use RAM. I don't really want to buy another SSD drive since they are so pricey. Any thoughts?