In my experience the CPU is actually probably a good chunk of that power draw.

I swapped my trash cans CPU for an E5-2560L v2 I had laying around and I pull like 30-40 from the wall of if I remember right. 20 cores at 1.7GHz. Low and wide, which for my purposes (low grunt container workloads, home assistant, and such) is perfect. 70W TDP compared to the 130W standard six-core CPU.