I have a pair of 2ndGen 160GB X25 SSD. one drive scores 240 two drive in raid0 with 128bit blocks scores 357 Interesting finds: Base on benchmark test raid0 boost overall performance from single by 48%, or you can say a single drive is 67% as fast as raid0 bootup # of complete spinning graphics after apple logo pops up raid0: 3-5 singe: 5/12 to 8/12 You can only see a difference when copying files larger than 700MB, otherwise the performance is unnoticed. All application open up in less than a bounce in either drives. Dashboard with TONS of widgets will load in less than 1 seconds in either drives. Conclusion A single SSD boots up faster than 2 SSD in Raid0 Raid0 has no real world performance gain in write other than copying files over 700MB. There is no real world performance gains in read because one drive is already already so fast, a 50% boost is negligible. I think it feels like graph of square root function (maybe not so extreme but close) where you increase the speed-x by 50% but output-y goes nowhere So unless you are always working with files (i mean editing) in the gig range, there are no advantages of raid0.