Where was this optimism in jan 2017 when eth was 6 $ and btc ~ 600-1k ?
I might be misremembering but wasn't Bitcoin over $2000 and more like $2500 in that timeframe?
Any other suggestions when it comes to strong 120mm fans to move the air through 4U chassis?
Any of the Delta AFB series in the 140-200 CFM range are pretty quiet - and the AFB series don't have the high pitched whine of the FFB series.
Had a bunch of them in my Innosilicon A2s, kept them when I finally got around to scrapping out the A2s and they're now doing "push LOTS of air through the air filter assembly from the window" duty.