So those connectors still only support 2 drives each?

Yes, that's all the IDE cabling spec supports.

So basically, you can have no more than 4 drives in a RAID on this board, right?

Yes. If you want more RAID than that, you probably want http://www.3ware.com -- I haven't used one, but I've heard nothing but good stuff about them. Those cards are PCI64 but will work in PCI32 slots as long as there's nothing physically obstructing them (but looking at your board, that might limit you to PCI slot #2).

Peter