Seems the new Bitmaintech S4's will only work on the Guild.......
Expect your hash rate to go up

And others say they don't work on Guild...I love how it seems ASICs are becoming even less consistent than their first generation units.
Everything I've ever mined with from 1st gen stuff to the most recent gear has worked best at the Guild. I have several old Bitfury rigs still running and they only like it here. They didn't even work well on GHash and that's their bread & butter miner, lol.
I hate to say it but my SP10s get a better hashrate here although I hate the luck.