Would love to add a s9i but they auto-tune from what I've read, little user control
My V9 is most likely a rebranded S7 and more expensive to run
However, I've under clocked it down to 300mhz and it runs 8 ~ 10 C cooler in the garage (2T/hs)
Crazy but I'm going with a second one to add to the cKpool
Prefer to be in control even with the higher operating cost