1) pumped price a bit with Chinese trading
2) lowered diff a bit by keeping the s-9s off line
Why? I have a few ideas
But looking for your ideas.
S7 batch 18 is in the sell at bitmain site, from 2nd June.
First they must sell all their S7´s, they could start selling S9´s only after S7 batch 18 is sold. Obviously good Bitcoin price might bring interest even to the S7´s, so I guess bitmain is already mining with S9´s only - and all their S7´s are offline instead.
I suppose they took all s-7s off line .
Made s-7 life's with some and kept others as s-7s
But to,keep diff down they have some s-9 on line not all.
They started selling the s-7 lites which was a good deal if you had psus of better quality as you could sell the one they shipped to you.
I figured you could buy 4 s-7 lites with shipping for 1291 - 291 for there gold psus if sold on eBay.
So 10.8 th for 1000 bucks.
If you purchased 2 s-7 s they came to 1020 dollars
So you were getting 10.8 vs 9.4 th for less $$
And I would think more over clock. Since it was 8 board vs 6 boards