Yes, 7 disables defrag and other features, too. Although RAID0 would be slightly faster I've heard it's best to just go with the biggest SSD you can afford and don't bother with RAID. I've used various RAID systems (back in Raptor days) and they were great back then. But now you're doubling lightning fast performance which is hardly noticeable.
I just wanted the best performance I could get with the amount I could afford, and even if the performance isn't that much better, since they are 256GB, they were cheaper than just getting a single 512GB drive anyway.
From the benchmarks I have seen though you do get quite a performance increase by putting them in RAID0, although there is a slight suffer in random 4k writes (the 840 pros were just too expensive for me)http://www.storagereview.com/samsung_ssd_830_raid_review