ASRock AM1H-ITX DC power and discrete video card?
The ASRock AM1H-ITX is a nice little motherboard with the bonus versatility of having a DC power jack for 19V external power supplies -or- the standard 24 pin ATX power connector. Having DC input (barrel connector) as a power option begs the question of just how much power input is supported (i.e. how many watts, or amps at 19V)?
As an aside, a NUC power supply is compatible and we know they do not put out much power. Most small 19V netbook/laptop power supply bricks these days seem to max out at around 40-80watts or ~2-4amps (@ 19V). On the other hand, Dell and other manufacturers with gaming or workstation laptops do have some 200 watt+ power bricks out there.
So, back to the original question, how much power can the AM1H-ITX accept through the DC power jack? The manual gives us some info: 41w, 56w, and 60w are the three wattages they list in the manual
Sadly, the manual also states that discrete PCIe video cards (or ‘the VGA card’ as the manual quaintly describes them) are not supported when using DC power input. I have not tested this limitation but I would a low power discrete card can be used. It would be awesome to be able to run a NVIDIA 750 GTX (vanilla or Ti) and the AM1 with just DC power input and no internal power supply.
2014.07.07 UPDATE: checkout Mike’s awesome build with a full discrete Maxwell NVIDIA 750 GTX GPU running via DC power!