> I very much doubt that. N100 maybe, just maybe, could go lower than 20W if the power source is very very efficient, but I haven't seen any system with 10+ SATA ports. The commonly suggested solution here, to add a server SAS/SATA controller, would double or triple the idle power.

The N100 on its own can go quite low - my N305 system idles around 5W. (But laptop, so zero SATA ports.)