[CentOS] OT: hardware suggestions for video capture card for a server

We've got several secure rooms, with video surveillance 24x7. A few years
ago, we got a couple of cards based on BT878 chips, which we use with the
motion package. I've posted here about hardware issues...

After a fair bit of testing, the cards just don't seem to be compatible
with Dell rackmount server firmware. They work fine... on older Penguins,
which are Supermicro. It's clearly not an o/s issue, it's hardware -
having tried two Dells, and swapped cards between the old Penguin and the
newer Dell, it's the Dell m/b.

Does anyone have any suggestions, possibly for video capture cards,
perhaps on newer chips? The two requirements are a) accept BNC connectors
from the cameras, and b) must have *four* actual channels, not one
multiplexed.

Thanks in advance, folks.

       mark