TLDR: The BIOS shows voltages as vcore: 1.248, 12V: 12.566, 5V: 5.160, 3.3V: 3.424. Is this bad?
I got one miniITX motherboard that supports a 19 V laptop input instead of the regular ATX connector/PSU. The motherboard manual says the input should be 19 V ±10% = from 17.1 V to 20.9 V.
When I use the board with a 500 W seasonic PSU via ATX connectors, the voltages are all almost right on the specification (12.0 V, 5.0 V, and 3.3 V), but when using the 19 V external 90 W power brick (which provides 19.3V when tested without any load on) I get the voltages:
- 12.513 ~ 12.566 (jumps from one value to another. Always those two numbers)
- 5.088 ~ 5.160 (oscillates between those two. Most of the time it is at 5.136)
- 3.408 ~ 3.424 (oscillates)
- With a vcore of 1.240 ~ 1.248 (like 12 V, jumps from one to another)
Is that bad? I tried running the PC like that and Debian installed fine. No hicups. Will that lower the life of any component? Will it all go down in a ball of fire eventually?
The outlet measures a total draw of under 30 W (30 at peak) from the power brick. So it is nowhere near its rated 90 W output (and it is from a know brand, so not a cheap overmarked knockoff).
(I put overclocking on the tags to reach people that may know better about this :) - although I am not overclocking. The motherboard doesn't even allow it.)
edit: those numbers are from the BIOS screen. i can't log them over time because those sensors are not supported in linux yet... sigh. but they do not seem to change with board temperature (i.e. running for a few hours and then rebooting and looking at the numbers on the BIOS). but i can't ever check them while under actual load.