Actually, if I recall correctly, SATA support was available back in RH9. Silicon Image SATA controllers are pretty well supported. I have 2 units of ASUS A7N8X-Deluxe boards with built-in SI controllers and also 1 older P3 with with an SI controller as an add-on card. All working perfectly. However, I've heard that you should avoid Promise controllers like the plague.
--== Anything can go wrong. It's just a matter of how far wrong it will go till people think its right. ==--