I have pretty good luck doing this:
On bootup, as soon as you see the POST screen, hit the Pause key and record the BIOS code in the lower portion of the screen. Then go to:
http://www.wimsbios.com/
and see what kind of MB stuff you can find. I've tracked down virtually any drivers I might need for any MB I've ever come up against.
A fairly recent BIOS (last 10 years) should have all the info you need in the code to track down what drivers you need.
Hope it helps.