So it isn't worth spending $400 on card that has same speed as $200 card.
38% wasn't from me. I was using similar method of extrapolation. I get 160S on 480, no overclocks. ~60% MCU on Claymore 6.0.
Bether bang for the buck on the cheap 1060 3gb and private kernels. The public Zcash sp-mod #1 produce 80Sol/s on 60% tdp.
For the cost of a 1060 3GB, you can get 480 that will do 160Sol/s easy. Sure it will use more power, but doing twice the solves. Nvidia not optimized yet, but in theory a low budget 470 should be faster than 1060 due to memory. 1060 3GB is a lot better perf/$ than 1070 though.