Best Underclock For THor P2

At 6.7 TH pulling under 90 W you're already at about 13 W/TH, which is close to the floor for the P2 without sacrificing stability. Dropping voltage further usually costs you more hashrate than you save in watts, so you end up less efficient. A couple of P2 owners here settled around 490–500 MHz and 1040–1050 mV for the sweet spot between power and uptime. If you want to squeeze another watt or two out, try 480 MHz at 1030 mV and watch it for 24 hours; if it stays above 6.5 TH without faults, you're golden. Keep the room under 28°C with 10 cm clearance on each side. Common mistake: chasing the lowest wattage by dropping voltage too far, then losing efficiency when the chip throttles or needs frequent reboots.