Pascal was indeed a big jump in efficiency, but that by itself doesn't really reflect the longer term trend. Prior to Pascal efficiency had stalled for a couple

Pascal was indeed a big jump in efficiency, but that by itself doesn't really reflect the longer term trend. Prior to Pascal efficiency had stalled for a couple of years as GPUs were stuck on a 28nm process for much longer than previous node sizes. This pattern is likely to continue as advancements in fabrication continue to slow down and architectural gains become smaller.