People still banging on about drivers when there is another thread on Nvidia instability, another TDR issue(which has been going and coming back for well over two years with a huge number of users effected).
Witcher 3, with an 'old' driver works dandy on all AMD architectures, performance is as expected and generally strong, single gpu is perfect. xfire not great, but single gpu perfect.
Nvidia, multiple drivers, most unstable for huge numbers of users, entire generations of products were drastically underperforming(on all drivers new and old). SLI scaling particularly on Kepler was terrible. People who had paid near enough 2 grand for Titan X sli are complaining that while performance is lower in single gpu the game is smoother and more playable. The instability is present for all types of users, sli, kepler, maxwell.
But AMD have a driver issue because xfire sucks in Witcher 3 even though sli is highly problematic in Witcher 3 anyway. Despite it being an Nvidia game, it's more stable on AMD drivers released before the game was launched. Damn those old AMD drivers, I'd far prefer to have 3-4 different versions of specific Witcher 3 drivers all of which have various problems and introduce crashing.