ShintaiDK
Lifer
IAMD path:
Moving from HD5870 $370 card in Sept 2009 to R9 290X ($550) in December 2013 meant that in 3 years, we got almost 3x the performance increase:
http://www.computerbase.de/2013-12/grafikkarten-2013-vergleich/10/
NV path:
Moving from March 2010 GTX480 $500 (using 7850 as a reference) to May 2013 GTX780 $650 meant that in 3 years, we got 2x the performance increase.
http://www.computerbase.de/2013-05/nvidia-geforce-gtx-780-test/3/
Your AMD path is 4 years. And if we use the the 6970 instead that fits your 3 years number. We are suddenly down to 2.28x.
With nVidia if we use the GTX780ti its not 2x, but 2.48x.
And when you consider the timeline, they are both about equal.
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