Hi, I need to change my G4 MDD's drives, because they suck (has the basic 60 GB 7200rpm as boot drive and a 5200rpm 120 GB taken from an old pc). Take this as a challenge : I want the fastest stuff possible for that machine, and yes I know its old. I do not want to go the easy way, so keep that in mind. Ok, so here's what I have in mind. What I know: -PCI SATA I cards are bootable -PCI SATA II cards are not bootable but faster -SATA I to ATA adapters are a bit slower but they spare a PCI slot What I want to know -How the speed of the boot drive affects OS X's speed -What are the fastest drives for SATA I interface (it can be a SATA 2 or 3 drive, but keep in mind that they will slow down their speed while using SATA I... so maybe a SATA I drive can be faster or equal?...) -What are the fastest drives for SATA II interface Thanks! P.S.: If you have some real word speeds that confirm what you are saying, that would be much appreciated!!