Many (maybe most) of the Pico PSUs pass through 12V directly, so you have to use a good 12V DC PSU with a reasonably clean, regulated output. Other than that, if you're estimating the GPU at ~20W, a 60W supply should be enough. Those Atoms are pretty efficient. The D2500 is quoted as 10W TDP, so even if you double that for other mobo devices, you've got some room.

As always, watch for crappy caps. Also be careful with your wiring. I reversed the polarity of the DC supply once and the Pico board I was using did NOT handle it very gracefully, but at least it only killed itself.

SirNickity wrote:

Many (maybe most) of the Pico PSUs pass through 12V directly, so you have to use a good 12V DC PSU with a reasonably clean, regulated output. Other than that, if you're estimating the GPU at ~20W, a 60W supply should be enough. Those Atoms are pretty efficient. The D2500 is quoted as 10W TDP, so even if you double that for other mobo devices, you've got some room.

As always, watch for crappy caps. Also be careful with your wiring. I reversed the polarity of the DC supply once and the Pico board I was using did NOT handle it very gracefully, but at least it only killed itself.

Thanks. A thing I don't like of the picoPSU was the pcb directly soldered into the atx connector, not the greatest choice if you've to disconnect it various time resulting in serious force on solder points. Also it had a (classic) round connector at the end of a green wire I thought was the ground one and instead it was another (?) +12v wire for who knows which reason, with no indication about it and risked to break the psu.
But the Coolermaster 500W I have while much more than enough for the system is really cheap in the internal components and capacitors. Tot buy a good psu would cost me more than the entire pc. The external ac-dc psu is a cheap one too, no brand, running quite at high temperatures even with 20/30W load.