I didn't know about intensity settings, but there is something weird, 1060 6gb cards see about 0.5mh/s speedup after setting -x 20, but 1070s are losing 2mh/s each on -x 20, what's happening ?
Because the different sm counts on the gpu's. I didn't set defaults for the 1060 6gb.
does -x 40 work on the 1080ti?