tc - the i.MX31 SOM is sub 2 W max power.
The voltage in is:
From the i.MX31 HW Spec.
http://www.logicpd.com/do...2C_iMX31_HW_Spec.pdf
Section 1.6.1.1 --- 2.7 - 4.2Vdc
The supply that ships with the kit is + / - 10% or roughly 4.5 - 5.5 Vdc at 3.8 amps. The baseboard uses a basic power supply that was not optimized for efficiency.
The weight of the three boards is about 9.5 oz. (in the static bags).