I had six small arm and x86 boards in multiple locations and an empty 4U rackmount case. So, I modified a power supply to power all six boards. All of the boards except the atomicpi (has rubber feet on it) are mounted on risers about 20-25mm off the motherboard plate. There are the following boards in the case:
- Udoo x86 with 256GB SSD and 30GB SATA M2
- NanoPiM4 + SATA hat with 8TB HD and 256GB SSD
The entire system is pulling 59 W at the PSU cord according to my kill-a-watt.