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#1 RAID5 requires 3 disks.

#2 Don't run RAID, especially 0 because if one drive fails, your entire system fails. You might get better performance, but you risk losing data, and if that happens you'll have great difficulty retrieving it. RAID1 would be better since it gives faster reading which is what you'll need for games, but slower writing, which won't be too noticeable.

Might want to look into the Q6600's, they've dropped down to sub $300 levels and will leave you set for the next 5 years.