yeah decent price for a 1070. that 1070 mini i bought from you does ~3.8 sol/watt, im happy with it.
but i figure i should go with a 1080 or 1080ti to try get more efficiency.. or is the 1070 the sweet spot as far as watts/hash?
1070 ti followed very closely by the 1080, if operated at their most efficient spot both will hit 4.4 easily with peaks pushing 4.7 sometimes (I don't count "peaks" where the power is temporarily WAY below the set point as those are statistical abberations).
1080 ti will top 4.1 easily and might hit 4.2-4.3 with a lot of tweeking on a good card.
1070 struggles to get TO 4 in my experience with several models, but will usually manage it with enough settings work - this specificially includes the Zotac Mini and the Gigabyte ITX.
When you factor in total system power draw, the 1080 ti closes the gap a hair.
The 1080 has more "upside" than the 1070 ti when both are run above the "most efficient point" but both drop efficiency pretty fast above about 115-120 watts, and the 1080 normally costs ballpark 10% more for a "same model" card.
The only advantage to the 1070 is the lower entry price - but it's not THAT much lower than the 1070 ti, and at "most efficient point" for each card the 1070 gives up close to 15% hashrate while only being ballpark 10% cheaper for a "same model" card.
It also depends on what's on sale and what prices are like in your area.