Interview with John Byrne - AMD VP of World Wide GPU and Chipsets
 

Were very confident in our architecture. Most of the DX10 games weve seen so far have been rather straightforward ports of DX9 code and that process is fraught with difficulties. If the code was originally written with DX9 in mind then it often doesnt translate well to DX10 and for that reason quite a few games seem to have lackluster performance. Were gradually seeing a trend to true DX10 coding and when that happens it brings huge benefits. The Acid test seems to be simple. If, at the same settings, the DX10 game runs slower then in most cases you should stick with the DX9 version. But if, at those same settings, the DX10 version is fastest then youre probably looking at a great and new piece of coding. As we go forward, we certainly expect more and more games to have a native DX10 code-path and thats great news for us. It gives gamers a much better experience and really lets DX10 hardware like the RV670 shine! Thats when youll see why our DX10 hardware was the right choice!

http://www.driverheaven.net/dhinterv...yrne/index.htm