I looked into this with my new Nucleus.
It has a modern i3 processor, don’t know how much RAM, the basic SSD (I think 128 GB?) plus my added 2 TB SSD.
Power consumption with the audio stack off, just the Nucleus idle plus a switch and some minor stuff: 14 W, not 30 W
Power consumption with a MicroRendu/LPS1, Meridian 818 + DSP8000SE on: 180 W (whether music is playing or not). Note that those speakers contain DSP, several DACs, and five 150 W amps, but the amps are class AB.
I can’t measure the power consumption of the Nucleus while processing, because my power measurement comes from my PSAudio P10, and the only way to measure the Nucleus alone is to turn everything else off, and Roon won’t play with no output available.
Roon performance indicator:
44k upsampled to 176k: 45X
44k upsampled to DSD64: 5X
44k upsampled to DSD128: 2.6X
44k upsampled to 176k + convolution with 131k taps: 18X
44k upsampled to DSD128 + convolution 131k: 2.4X
The Nucleus handles my demands well.
EDIT Correction, the Nucleus idle draws 14 W