The official guidance is on http://www.microsoft.com/technet/windowsvista/evaluate/hardware/entpguid.mspx#EID

 

Current GPU Guidelines for Windows Vista Capable PCs

Get a list of Intel GPUs

Note Intel is supplying this data and is solely responsible for its contents; please look for GPUs.

Get a list of ATI GPUs that would support WDDM

Note ATI is supplying this data and is solely responsible for its contents.

Get a list of NVIDIA GPUs that would support WDDM

Note NVIDIA is supplying this data and is solely responsible for its contents.

Microsoft is currently working with other graphic vendors to provide a comprehensive list of GPUs that would support WDDM. Check back here soon for additional information.

Please note that many factors beyond Microsoft's control can affect overall PC system reliability and performance. To better protect your hardware investments, contact your PC vendor to identify solutions that meet these CPU, RAM, and GPU guidelines.