Phil you're awesome!
I have some of those motherboards on the way, also I have a z170 with 4 PICEx16 - spacing is going to be tight for a 4 card 1080TI no riser but I'm going to run it just to see how long it can go. Should get here monday.
My new bottleneck - these stupid Corsair 750's only have 2... TWO! 4+4/6+1 power ports. The Rosewill 850w you suggested does have 4 PCIE power lines, so I just need to get some more cables that have 2 sets of 6+2's in them, I ran out. I upgraded a dozen 1070's to 1080Ti's today - hardware always takes longer than you expect. Was expecting to unscrew, unplug, swap and be done. The power cords threw me for a huge loop.
I was thinking about running power from my 1500w EVGA but I actually don't have long enough cables for that either.
So back to the drawing board.
https://www.newegg.com/Product/Product.aspx?Item=N82E16817438061This EVGA GQ 850W has EIGHT 6+2pin. You could technically put 4x 1080 Ti on that Biostar mobo.
Just make sure to get the blower versions of the gpu and lower the power limit to around 75 to 80.
never used your psu pick it looks good
https://www.newegg.com/Product/Product.aspx?Item=N82E16817438061I ran the biostar z170 with 4 rx 480's no risers it gets
hotthe setup I did with 3 cards above is pretty much fool proof zero heat issues 2300-2400 for skein only 550 watts.
it will run on the biostar z 170
it will run on the gigabyte z270
https://www.amazon.com/gp/product/B01N2V0AHI/ref=oh_aui_detailpage_o00_s00?2300 for skein or 1800 for zec low power 550 watts
all three cards
cool.Since I have lots of biostar z170's I will use them.
as for better boards no board that I know has 1-4 -7 spacing.d
but the 1080ti - 1080ti - 1070 msi mini super short allows for 3 cool cards. 72-75% tdp's
my garage is hot 90 f
cards still run well under 70c at 75% fan.
my rack can hold 6 rigs that would be more then 6 x 2200 = 13200 for skein or 6 x 1800 = 1080 for zec at 6 x 550 watts = 3300
I would be earning over 150 usd a day for that power.
btw the evga psu you link is a good one for one of these rigs.
I own 2 and ⅓ s-9's they use about 3300 watts they earn 33 dollars a day
same power bill at 20 cents a k-watt about 16 dollars a day.
so one setup earns 150 cost 16 to run at 20 cents a k-watt cost 8 to run at 10 cents a k-watt cost 4 to run at 5 cents a k-watt.
one setup earns 33 costs 16 to run same as above.
basically these gpus compete at 20 cents a k-watt as well as s-9 do at 4 cents a k-watt.
I plan to have 6 rigs on that rack
1)1080ti 1080ti 1070 4)1080ti 1080ti 1070
2)1080ti 1080ti 1070 5)1080ti 1080ti 1070
3)1080ti 1080ti 1070 6) 1080ti 1080ti 1070