Hello homeduck and welcome to the forum,
My Mini-ITX computer with J4105 CPU, 8 GB RAM and 3 SSD (data 1 TB + 2 TB and system 16 GB on USB3) draws a power of almost 6 watts in idle and 12 watts when booting the computer. (source: https://forum.openmediavault.org/in...t-can-come-close-to-arm-for-power-efficiency/)
But since you already have chosen a case that is compatible with an SFX PSU, I would just go with that kind of PSU form factor.
What is your aim at going 12V?
With such hardware, PSU requirements are quite low. This is what I found:I have bought a second hand silverstone ml09b case which hosts Sfx PSU, Hw is made up an asrock j4105 mb, 2 ssd and a slim sata drive. How can I understand which Meanwell psu fits my purpose? I mean if 100W or 150W or more.
My Mini-ITX computer with J4105 CPU, 8 GB RAM and 3 SSD (data 1 TB + 2 TB and system 16 GB on USB3) draws a power of almost 6 watts in idle and 12 watts when booting the computer. (source: https://forum.openmediavault.org/in...t-can-come-close-to-arm-for-power-efficiency/)
But since you already have chosen a case that is compatible with an SFX PSU, I would just go with that kind of PSU form factor.
What is your aim at going 12V?