Wow 13TH for less than 0.5BTC now from Bitmain.  I might actually swap out my S7s for S9s.

But its summer, and my S7s can survive my 110F garage just fine when running 4.5TH (Batch 1/2, so higher chip count).

How are S9s with high ambient temps?  Can they be slightly underclocked to compensate?

Thanks for any info.