Q1900DC-ITX here.
With just one 1 TB HD (for now) hibernating: 12-13 Watt. CPU running at 1333 MHz.
A little bit more than I expected (hoped for <10 Watt), but overall not bad.
It's all working nicely on my q1900-itx with the Intel j1900 CPU.
What I am unable to work out is if the CPU uses burst/turbo mode.
Does anyone have an idea how to verify this?