Some update...

If your GTX 1070 with modified TDP and OC reached 420 with current version, then next version will give you 450 (same settings).

GTX 1060 6G limited to 90W TDP and overclocked memory is hashing at 290. Going to 300 or more with 1060 will be easily possible (with OC of course).

GTX 1080 overclocked to 2100 and memory to 5300 gives 490. But the real power of this card is when limiting TDP. 115W TDP limit with mem oc gives 460 sol/s.