[Dalewyn]

Got any specific numbers?

On the Intel side of things, I've seen my 14700K idle at around 5W (which shoots up to 300W under load, I find it greatly amusing) and my 12700H at 0.5W or less.

[pohuing]

My 5900x, with core parking on and energy saving windows settings idles at 45W package power. Only two cores are really active, one each at ~2/3W. The others at <0.1W.

[RachelF]

My 5950x idles at 35W. It's a known problem with AMD. It isn't the CPUs using the power its the uncore/SoC that eats the power.