Its look that 1080 is not so bad for ZCASH as i see in many discusion… What do you think about it ?
Currently get around 610 sols on the 1080 FTW hybrid at 120% +50 on GPU and +950 on MEM
my setting is TDP 60%, core +100, mem +400.
what is your efficiency with 120% TDP ?
one rig i have with 6x1060 with eff around 3.4sol/w, but test with 1080 surprised me 
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The only thing that bothers me a bit is …
1080 → 550 Sol - rough price 500-600+
1060 (even 3 GB) can push 290-300 Sol. Rough price 220-250
2x300 sol for say max 500$
vs
550 Sol for 500-600$
it seems cheaper to buy/run 1060s…That is only if you don`t care about electricity of course and if you have the free space to add multiple 1060s.
Because those 2x1060 would consume roughly 240 watts on max TDP.
But for people who have the $$, adding 5-6 1080s in 1 rigt would get best results I assume as a total cost vs benefits.
you are right, if u have free slots, its 1060 beter choice. I did not get 300 sols with 3GB version, but 270sols with 60% TDP its good for me (70-77W). But I have special price (heating tariff) aprox 0.085$ for 1kW.
At 120% my eff is around 2.9 to 3. I have free electricity where i live so eff isnt really a concern
Then 1080 all the way
p.s. for 1060 3gb to reach 300 sol you need 100% TDP and +50-100 core clock. But Temp will be a bit higher and needs higher fan RPM + more electricity of course.
There is no magic combination. Everybody can use any combination they see fit per their needs.
good luck.
I get just over 600 Sol/s with a Zotac GTX Amp Extreme on 90%TDP +50 Core +700 mem
I get about 550 Sol/s on the Zotac GTX 1080 Mini 90%TDP +50 core +350 Memory