Originally Posted by Xion X2
Well, every developer I have seen to this point has said that DX10 is a more efficient API, so hey, it's not my word but theirs. They're the pros in the business. I tend to believe them over the hordes of Vista-haters that are out there(not including yourself.)
DX10 is more efficient than DX9 at rendering DX9 effects, but when it comes to DX10 effects, it's not efficient, at least not with current hardware.