I did a few bench myself but not with 0..
I did
quantum atlas 10k raid 1 (mirror) 2 drives
quantum atlas 10k raid 5 (s/p) 3 drives
quantum atlas 10k raid 5 (s/p) 4 drives
seagate barracuda 180gb 7.2k raid 5 (s/p) 3 drives
seagate barracuda 180gb 7.2k raid 5 (s/p) 4 drives
I used winbench, the speed of mirror and raid 3 drive & 4 drive stripe with parity isn't that great, maybe 5-10%
also the suprising thing was 7200rpm scsi raid 5 isn't that much slower than the 10K raid 5, about 3-4% difference..