Alex is using the s9 waterblocks you can find from alibaba if memory is correct.
No, I've designed my own blocks, the alibaba ones are not fitting properly on the board.
That's neat. Is the s9 different than the s9i? s9i already mines at 14.5 per bitmain.
This will work on any S9 machine with a board versions higher than v4 . The older versions don't overclock very well,
but they can be run at smaller frequency. The chips are the same but the power module is more stable on the board,
that's why it allows better OC.