Performance per watt is very important for devices that need to run on battery and for cloud compute where you're running thousands of them and saving on electr

Performance per watt is very important for devices that need to run on battery and for cloud compute where you're running thousands of them and saving on electricity/cooling would be significant. But it's almost completely unimportant for always-plugged-in-to-wall-socket desktop chips. Because even the power consumption of stuff like the 3090 is still pretty insignificant on your power bill compared to up front cost, and relative to the power consumption of all the other stuff in your house. Remember even the 3090 consumes very little power when idle - it's only pulling the rated ~300w when you're maxing it out playing heavy games or rendering or whatever.