Too bad about DriveMarks. It would be an interesting test on my workstation. Storagereview needs to release a common benchmark that users can run to compare their hardware. IO Meter does not give a realistic result for single user SCSI RAID.
I found that setting my 320-2 to read ahead, write back, direct IO did help performance on gaming, EE analysis software (PSPice), and other high disk utilization apps MyDVD, Photoshop, Autocad, etc. Changing to PCI-X SCSI RAID with my configuration is to increase throughput. I will have 6 active + 1 spare per channel. I was surprised with the results. If they considered U320 SCSI RAID, why not include it in the graphs?