High Point Rocket Raid 622 Does Not Show Up

I am tryng to get a HP Rocket Raid 622 to show up on a 2009 Mac Pro 2.66 Ghz macine. I recently removed a 622 card, which was working fine, that had come with a Sas Digital RAID 5 enclosuer. I sold the enclosure and with it, the RR 622 that was inclueded. I purchased a new 622 and that unit will not show up in my system. I'm running Mac OS 10.6 which is supposed to recognize the card without drivers. Any suggestions would be helpful.

Thank you.