These are all good points. In my setup the ATX supply was also used to power a PC motherboard which functions as boot server and iSCSI target. The 5V rail could be under 5V, but the pies have neither USB, SD cards nor use WiFi so there isn't much that could be affected by a stable but lower input voltage.
Another ATX PSU user here. Been fine for my use case (CM4 based NAS with a mix of 3.5" and 2.5" drives). I did have one fail but it was old and repurposed. The new one has been running 24/7 for several years.
Aside from fake power supplies full of rocks and nails, faulty capacitors assembled in otherwise good designs is a reason to avoid ATX supplies from a certain historical period. Unfortunately new supplies focus on 12V and generally have half the 5V capacity of earlier models. For comparison, the ATX supply I used provides 40A at 5V.
I assume the right angle adapters are for use with official Pi power supplies that have non-removable power cords. Otherwise, one should be using a custom cable with fewer pieces.
With POE there's a possibility of remotely cycling the power when something goes wrong. In my design I used the run pin on each Pi 4 as a way to perform a hard reset remotely. Do Pi 5 computers have a similar run pin?
Dunno if there is a run pin but AIUI you can use the pads provided for a remote power button. Long (four seconds?) press to force power off followed by a short press to power back on.
Statistics: Posted by thagrol — Sat Jan 25, 2025 12:21 pm