WMV9 and WMVHD are the same de/compression codec, different bitrates.EnderW said:But the 6600s don't have it either.
And I do say that my 6600GT has WMV9/HD acceleration by my low CPU utilization (35%-45%) on a pretty modest CPU (P4 3GHz) playing back WMV HD 1080 videos.
http://www.nvidia.com/object/feature_on-chip-video.html
Another important factor is that the GeForce 6 Series GPUs are completely programmable and can handle formats such as WMV9 and MPEG-4. The NVIDIA motion compensation engine can provide decompression acceleration for a variety of video formats including WMV9, MPEG-4, H.264, and DiVX. As with motion compensation for MPEG-2, the NVIDIA video engine can perform most of the computation-intensive work, leaving the easiest work to the CPU.
I guess nvidia missed a page. It's already December and there's still not a good explanation of the state of that above and it's been out for 6-7 months. Class action time.