I have the Rev A. Dual 1.8 G5 with 8 DIMM slots, and I am interested in keeping this machine for as long as I possibly can. I know the new Intel Minis are faster, but I already have a considerable amount of hardware invested in my G5, and I would like to hold onto it until it no longer suits my needs. (I had my previous mac for 8 years) My needs really haven't changed much since I purchased it back in 2004, so I do not need to consider 10.6, CS4, or anything else to that effect. My current specs are as follows: Dual 1.8 5gb Ram (all slots filled) 160GB HD (stock) 750GB HD (second bay) eSATA II card What I would really like to do is make my G5 a bit snappier in day to day tasks. Would upgrading the boot HD to a 10,000 or 15,000 RPM drive make a significant change in performance? Would a higher RPM drive saturate the SATA bandwidth? 10.5 really took a toll on my system's performance, so I would really like to take back some of the ground I lost with the upgrade. Thanks in advance.