3GHZ P4 running XP MCE with Nvidia 8500GT GPU. With DVBViewer getting 20% CPU when decoding TV3 at 1920x1088. Without GPU acceleration CPU is at 100%.
DBViewer Directx video renderer set to VRM9 (or Vista EVR).
I loaded latest NVidia GPU drivers (Forceware 169.21).
You need to activate Use DxVA in View> Filters > Cyberlink H.264 AVC Decoder (Azurewave)