Picking up a generic Intel Mini-ITX board and dropping a cheap Celeron or i3 into it can produce some surprisingly low idle powers. Around 10-11W is not uncommo

Picking up a generic Intel Mini-ITX board and dropping a cheap Celeron or i3 into it can produce some surprisingly low idle powers. Around 10-11W is not uncommon, which is lower than this quad Raspberry Pi 4 board. The key is to pick motherboards with minimal features (few extra chips to power) and an Intel CPU. Intel historically has much better idle power than AMD, although AMD held the power efficiency crown under full load for a while. Here's a random example from years ago of a cheap Mini-ITX motherboard and CPU with minimal idle power: https://mattgadient.com/building-a-low-power-pc-on-skylake-10-watts-idle/ https://mattgadient.com/building-a-low-power-pc-on-skylake-1... The ITX motherboards with built-in CPUs are great if you can find them, but they basically disappeared when the chip shortage kicked in. CPU vendors put all of their production into the expensive money-making parts.