Youngyy :
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just set your RAID array up, then, once you do that, just enable the cache option, pick the RAID as the disk to be cached, i tried it with 2 500GB drives in RAID, the speeds did not impress me though, went back to caching the one 500GB drive, finally ordered another SSD [120GB Mushkin Chronos Deluxe, the 60GB is a beast]to push my 2TB drive, all set![i boot from 2 drives, one for games, the other for Adobe software, Reason, Native Instruments software, Waves plugins, etc]