Originally Posted by madshi
NVidia cards have one big advantage: Custom resolutions. Other than that there's no disadvantage using ATI cards with madVR. Actually, playback in fullscreen exclusive mode is currently less problematic on ATI and Intel compared to NVidia, due to a nasty NVidia driver bug which has been there for ages. All those stupid tweak options in madVR are only there because NVidia makes smooth playback in fullscreen exclusive mode very difficult, unlike ATI. With NVidia you may have to tweak fullscreen exclusive settings a lot to get perfect results. With ATI, results are often perfect with default settings. However, I plan to report this problem to NVidia and hope to have it fixed sooner or later. Then NVidia will have the advantage again, thanks to custom resolutions. Don't really know why ATI doesn't offer something similar.
For what it’s worth, this has not been a problem for me since the 300 series of WHQL drivers from Nvidia with my GTX 570. The first time I tried playing back a video on a fresh install of Windows recently I was seeing presentation glitches, but after a few minutes that settled (I assume it was ReClock re-learning the system clock or something) and it has never had problems since.
That doesn’t necessarily mean that whatever the driver bug is, isn’t still there though, just that it has not been impacting me.
If you plan on building a system for more than just video playback (games) I would highly
recommend Nvidia over AMD. Better performance per watt now too, I think?