That doesn't matter as long as you get drivers for
the right chips, or close. I have a few boards with
highpoint raid chips built in, and the same linux
drivers work with several versions of those chips, and
with highpoint cards too. I currently have a promise
controller card in this motherboard.
Anyway, it's just important to get drivers for the right
chip. it doesn't matter whether it's on the motherboard
or a card. try the driver that matches most closely
to your chip.