at the bottom of this obscure article
http://docs.info.apple.com/article.html?artnum=306231
other drives might work. apple uses the word 'support'...Question: What drives does Apple support with the Mac Pro RAID Card and the Xserve RAID Card?
Answer: Only Apple drives are supported with the Mac Pro RAID Card and the Xserve RAID Card.
This one is likely to work much better - as it has a lot of RAM for buffering - i havent seen another raid card which does this- the others dont bother.
without this buffering the other raid cards are pointless - RAID is not faster than a single disc for catalyst.
And the performance of single SATA discs is not good enough.
Unless you are doing uncompressed video- or need only 3 layers to playback.
I test these systems day in day out for the last 4 years.
Gareth posted something yesterday about a RAID he had made - but he really only shows how poorly they work most of the time.
I can get at least 8 layers of DV out of my XServe RAID - for a 2 disc set.
No unbuffered internal raid is ever going to come close to this.