Just wondering about the S17+. Looks like all their issues are from solder melting and fans. So removing fans and running them it bitcool will keep them well below any problem temp. Brains os can get them up to 100Th/s. So for the cost of 1 S19 at 110 Th/s you end up with 3 S17+ running 300 Th/s. I have confirmed from Engineered fluids several people getting these results.