Thanks for posting your results! It does appear that Readyboost is best suited for netbooks and laptops. But then again, no one that I know has tested Readyboost on a disgustingly fast SSD drive either, or on multiple flash drives. What I want to know is, now that Windows 7 allows you to setup Readyboost on more than one drive, does it write the same data to all of those in use, or is the cache on each one unique? If anyone has two flash drives that are the same size and speed, would you do the following please: 1. Format the flash drives in exFAT with 32kb clusters. 2. Dedicate the whole flash drive to Readyboost. 3. Disable "Hide protected operating system files" in Folder Options 4. Hash the Readyboost cache files on each drive, and compare. If the hashes are the same, then theoretically they can be accessed simultaneously, and offer the same read performance as a RAID1 HDD array. That might be worth looking into!