Video editors (at least professional ones) either 1) only used raid 0 for transitory data with the understanding that it will be lost, or 2) use raid-10 or raid-3. If it's only a single threaded app (like video capture et al) then raid-3 is used often. raid-0 seems to be in the popular mind-set for people here and for gamers looking at just certain types of performance metrics without regard to reliability or if that metric actually applies to their use (ie, hdtune ). It's an unfortunate trend that I'm seeing over the past 5-7 years where people are not truly understanding their apps nor their subsystems.

As for on-board DFI (or any other say <$500 MB) no, on-board raid on the DFI is a what's loosely termed as 'fake raid' Speed is hard to tell as it's very dependent on the on-board implementation and the type of raid. RAID-5 for reads would be similar to a raid-0 w/ 1 less drive. writes is what the killer is when you are writing less than a full stripe as in that case every 1 OS write = 2 reads & 2 writes for a raid-5 to accomplish. (raid-6 is 3 reads and 3 writes). Also with the on-board of fake-raid solutions they don't have any parity offload so your cpu is doing that work (for rebuilds & writes, there is no parity checking on reads when the array is not degraded).