I read the power requirements in the manual for the DG45FC and it doesn't look like the PicoPSU 120W will be enough on *any* of the rails.
I'm no power expert, but can anyone verify?
That's what I was trying to tell you guys from a while ago... The peak amps the PicoPSU can cough up on the 12V rail is 8, and that's for under 60 seconds (if memory serves me right).
To put it bluntly: PicoPSUs are for 1) VIA-based mini, pico and nano-ITX motherboards; 2) Atom-based motherboards; 3) the D201GLY/GLY2 motherboards (and derivatives, Asus has one of those); and 4) VERY select single and dual-core mATX-based systems, mostly from AMD origins (like underclocked Sempron+ASRock NVIDIA-based board).
That being said, please look at this
thread, starting around post #116 or so (and yes, that's also me with the same nickname). There is so much stuff on that thread going on, also regarding power consumptions that it would be too much to just bring here... Also, before that post there's the reference to the AMD mATX builds.
However, it IS possible to run Intel-based systems off a PicoPSU, but it's not an easy thing to do, and you'll most likely need to underclock the CPU and MCH a tad, and also disconnect any unused stuff (COM, LTP, FireWire, etc.) to keep the consumption low.
On that line, starting on post #121 the really juicy stuff begins. Just keep in mind I'm using a G33 chipset as reference, which has lower power needs than the G45, AFAIK. Just keep in mind I'm a law major, NOT an electronics guru...
If you can, kick the PSU up to the M4 and a 200W power brick. That will definetely buy you some peace of mind.
Anyway, keep this mind when calculating your power needs:
a) Most important rails are 12V and 5V (12V for the CPU and HDD, 5V for HDDs - 2.5'' ones use only 5V);
b) 5V is also used for USB-powered devices, at 0.5A per port;
c) 3.3V should only be needed for PCI cards.
Hope this helps.