Raid 5 card (continued)

Thanks to Robert for this information:
The LSI Megaraid cards sold by Apple with the Xserves are standard cards of revision D. They work also on PC. The LSI SCSI 320-2x card has been tested with 6 HDs (3 HDs per channel) and shows 30% improvement over the results obtained with the SATA card in Raid 5. Quite surprisingly, the SATA 300-8x card is not performing better than the SATA 150-4x coupled to 4 HDs. This is probably due to the limitations of the HDs themselves. In addition, the software included with OSX does not make any difference between SATA and SCSI versions.
So the RAID 5 Pc card are probably working on Mac with OSX thanks to a "universal" BIOS.
The Mac compatibility of the LSI SCSI 320-2x card allows Powermac to get access to a highly performing solution for storage units; something quite unusual on Mac. Indeed, since 2 years, adaptec does not provide any support for its high-end cards 29160 and 39160. But those 2 cards are quite unstable on most of Powermacs; and in summary can not really be used in a professional environment (without counting that they are quite expensive).
So LSI is offering RAID 5 solutions complementing the already existing ones from ATTO (UL4S and UL4D) in SCSI 320 and Acard (AEC-67160M and AEC-67162M) in SCSI 160.