I currently have the following drives in my Mac Pro (Early 2008): WD6400AAKS WD7500AAKS WD5000AAKS Samsung HD203WI The Caviar Blue drives were bought in the pre-Black era, back in Early 2008. Or at least they certainly hope so; I purchased the WD6400AAKS as the boot drive thinking it was the fastest 7K available at the time (BareFeats review). I am about to install either an OCZ Vertex 2 or OWC Mercury Extreme Pro SSD in the optical drive bay. I plan to re-purpose the 640, and either the 750 or 500, as a Software RAID 0 array (using Disk Utility), backed up using Time Machine / Super Duper. The third WD drive will be used for Boot Camp. The Samsung is a "green" Media Drive (although AJA has it currently matching the WD 640 in speed). My intention is to improve the speed of access to user files etc, since a 60GB SSD is not big enough, nor suitable for my home folder. I therefore ask; am I nuts? (I am aware of the increased risk of data loss) My initial thought is that mismatched drives in a RAID 0 array may not result in the performance increase I am looking for. Apologies for the capitalisation error in the post title - wish I could edit it!