These new cards do pull quite a bit more power than their RX 5700 Series predecessors, but total system draw of 372 W under gaming load from the RX 6800 is still very good for this performance level. The RX 6800 XT draws quite a bit more, but the total system power of 427 W is 35W below our RTX 3080 FE sample.
As to thermals and noise, our initial findings are naturally limited to the AMD reference designs, but these set the bar quite high. We saw outstanding performance, very low noise, and controlled thermals. There was some pesky electrical chatter (choke/coil noise), but not obvious over normal system load noise.
Temps under load with the RX 6800 and 6800 XT were measured in a ~19.5 °C room, with the XT topping out at 77 °C GPU / 97 °C Hot Spot, and the non-XT hitting 77 °C GPU / 90 °C Hot Spot (according to GPU-Z). Clearly our cards were targeting 77 °C, ramping fans and adjusting clocks as needed to maintain this.
Fans reached 50% under load, which resulted in just under 38 dBA with the SPL meter positioned 12 inches from the leading edge of the card in an open case.