Pretty similar, yet still worse. You will literally hit the halving just as you start mining with these. Then the diff will skyrocket and make it even more pointless.
Why should diff rise after the halving ?
I think that many of the miners turned off, if the BTC price stays the same or decreases.
Bitmain mining with this (S9 blades) type miners already long ago.
Patch1 sales not affect difficulty very much. This is a small amount of very expensive and highly effective miners for home users.
What is important , what happens to with the all old miners. Turned off or still mining .
I think it turned out the majority of S3 and S5 and very cheaply sold a lot S7 in the whole world.
Do Bitmain will sell S7 upgrade KIT? This is the big question.
S9 Dimensions: 350mm(L)*135mm(W)*158mm(H)
S7 Dimensions: 301mm(L)*123mm(W)*155mm(H)
As shown, the S9 is longer
So I think , no upgrade KIT for S7