Nvidia Noise Reduction
Nvidia Noise Reduction 720p
For this round of comparisons I am only using Noise Reduction in the Nvidia Control Panel. I set Edge Enhancement to "Use Player Settings". I then played a 720p video and raised the slider for Noise Reduction by 25% intervals, starting with 0%. The only real difference that I noticed was that higher noise reduction settings actually made the images look more noisy. Once you set noise reduction above 75% the video will sometimes look kind of strange. Not sure what causes this exactly, but I would cap the noise reduction to around 60%. Every video will be a little different, so test out a few videos before you decide on what to set here.