Renters: what made you trust a listing?

Second this. undervolting bought me 18% efficiency for a small hashrate haircut, and I'd do it again.

Strong disagree with the last reply — I moved everything to a PDU with metering and the difference was bigger than any chip tweak. Anyone tried the opposite?

Genuine question first: firmware updates over USB first, OTA only after you trust the supply. Learned the hard way. What's your setup?