Lately I've been on an upgrade kick, and that focus has turned to my nearly five year-old Power Mac Dual 867MHz MDD G4. The machine is still extremely useful, and seemingly nowhere near obsolesence thus far, and before it begins to show its age, I'd like to soup it up a bit. I've already done little things like add a USB 2.0 PCI card, which also allowed me to internalize my bluetooth adapter (as it also had an internal port). So at this point, the machine has USB 2.0 and Bluetooth effectively built-in. I've been looking into throwing a pair of 320GB HDs into it, however in its current state those would be PATA drives, not very encouraging, to say the least. So now I'm considering getting a pair of 320GB SATA HDs, which are, of course, faster--and cheaper! This will also necessitate the purchase of a SATA controller (no big deal, the price difference between PATA and SATA drives oughta even things out). Basically what I plan to do initially is decommission the drives on the ATA/66 bus and replace them with SATA drives, and eventually do the same to the drives on the ATA/100 bus. Ultimately my question is, would I really see any benefit in performance by doing this, or would I possibly be casting pearls before swine?