however, the S2 is still a practical miner in a lot of environments as it can run at 1w/gh. by upgrading it you would end up with a stack of old hashing boards that are likely worth $100-150 in hashrate.
ideally bitmain will come up with a clever way to sell a lightweight kit consisting of a backplane/beaglebone and a way to mount a few fans so that the old S2 boards are not just junk