Ok, I merged my patch, with latest mrb release, it gives next speedup:
Total 329.4 sol/s [dev0 84.5, dev1 83.0, dev2 72.6, dev3 88.1] 36 shares
Total 329.8 sol/s [dev0 84.3, dev1 85.3, dev2 72.0, dev3 89.1] 37 shares
Total 330.9 sol/s [dev0 86.5, dev1 87.3, dev2 72.3, dev3 93.1] 37 shares
Total 331.5 sol/s [dev0 87.0, dev1 83.3, dev2 75.1, dev3 92.4] 38 shares
Total 331.9 sol/s [dev0 86.0, dev1 83.3, dev2 74.8, dev3 89.7] 38 shares
Total 331.6 sol/s [dev0 87.9, dev1 81.2, dev2 75.4, dev3 89.9] 38 shares
Modded RX480 up to 90sol/s, stock RX470 ~70sols/s
http://coinsforall.io/distr/main.c.opt2http://coinsforall.io/distr/input.cl.opt2http://coinsforall.io/distr/param.h.opt2RX480 with 90 sols/s preset is 1160/2240 clocks and timings from 1750Mhz (see polaris bios editor).