For the Pi4B's I do not use a case, instead just those alu heatsinks as bls links with with the Amazon URL. For a Pi4B-2GB I don't use local storage, but uses boot and root filesystems via NBD (networked block devices). It uses a TP-Link PoE splitter, no powerdrops seen although no PoE+. The PoE+ HAT I don't like, it has a fan and it concentrates the heat generation at the same spot as the PI4 SoC and chips. A separate, futher distance PoE supply doesn't have that issues, altough it needs more room, but that is no problem in my case.Short version: How can one reduce the power consumption on a Pi 4 and 5? I've disabled wifi, BT, and HDMI already, any other power-hungry components that I might not need and that can be switched off? Is there a way to set a TDP cap or similar, to optimise for performance/W? Underclocking/undervolting? (Nothing that impacts stability or "voids the warranty", so to speak, though.)
Longer version:
1) The Pi 5 with official cooler is way too loud for me. It's just running the Unifi controller headless on top of Lite for now, so hardly demanding, and still the fan spins up every couple of minutes. I'd really like it to be silent at idle, and if I need to gimp the performance a bit, so be it.
2) Same, except it's a Pi 4 with PoE+ HAT, to be used as a USB scanner server (saned). The scanner has its own power brick. Massive overkill for the task, obviously. This will be sitting there 23.9/7 doing absolutely nothing—there's no sleep mode, is there?—so minimal idle power would be good. Must be silent in idle. Even the performance needed during a scan is minimal. As long as it doesn't actually introduce lag I'm good.
There must be the same heatsinks for the Pi5 and if you also operate it via network, I think maybe it stays under 12.5W, especially if you underclock it, or maybe do tricks with using less than 4 cores.
As you say the Pi4 has nothing to do, maybe switch it off and move its software/functionality to the Pi5. It is a USB scanner and you work with Debian Linux. USB can be linked via IP networks, so you are not limited to 5m cable. It is called usbip . But I don't know how you do paperwork, your desk/office etc. Maybe Pi5 can't stay close to scanner.
Statistics: Posted by redvli — Sat Aug 17, 2024 5:12 pm