Based on these results, and compared to the NVidia results from a little while ago... ( http://www.phoronix.com/scan.php?pag..._metrics&num=2 )
Even the lowest-end AMD card tested, on FOSS drivers, has a lower % CPU usage than the highest-end NVidia card with their binary driver eh? And aside from those weird 3-4 cards in the 52+ degrees Celsius range, the rest were right around most of the Nvidia cards, temperature wise...
That being said, the most interesting NVidia benchmark is missing on this one. I'm interested to know the GPU % usage for these.
All in all: Congrats are in order for the AMD FOSS developers