Omega drivers tended to carry forward farther than AMD's own. It's only necessary, apparently, to carry forward as far as a year ago. I do not have any HD 4000 or older Radeon installed in a PC I have ready access to, myself, hyowever I have used those drivers inb the past. When the Bethesda Game I played last (I didn't play the one with required Steam as a DVRM check), so it was Fallout 3, and the minimum Radeon was the X850 Pro (officially).
AMD had dropped their support for the X800s, even the XT and the XL cards, which had been faster than an X850 Pro -- plus another -- XT Platinum, I think? Omega drivers let me run that game on an older model PC here, with an X800 of some kind in it.
