[CentOS] adaptec RAID

We've got this PC PitStop RAID box (they're so proud of it, there's no
logo), and what lspci tells me is an Adaptec AAC-RAID (ref 09) controller.
I see there's no F/OSS controllers for it, but when I go to Adaptec's
site, the search denies all knowledge of such a controller. I'd like to
get the correct one, and I really want an x86_64 version; googling found
me a 386 rpm.

Anyone know how to identify what *Adaptec* calls this thing, so I can find
the info I need on their site?

        mark