This is a difficult question to answer accurately. ADL Embedded Solutions offers a wide range of CPU boards; from low power 1.1GHz Atom™ processors (which can operate on as little as 7Watts of power, all the way up to a 2.1GHz Quad-Core i7 (which can require more than 50W of power under full load).
Total power consumption will also depend on the memory and I/O devices installed, the operating temperature of the board, and how much processing power is required from the main CPU during full load. Newer PC/104 board designs like the ADLGS45PC, ADLD25PC and the ADLQM67PC contain full support for ACPI power scheme. ACPI support is similar to the power features found in modern laptops. It allows the OS to monitor processor demand and input from the user, and control hardware and processor clock speeds in order to conserve power.
The easiest way to compare processor boards is to find the Intel Thermal Design Power (TDP) values for each processor. TDP Values for all Intel Processors are available in Intel’s support website. Although the TDP value for a processor does not represent the maximum power consumption, it is a clearly defined upper limit for the thermal maximum (and therefore closely related to total power consumption) of the CPU. Assuming the I/O and memory are the same for both systems, customers can compare the TDP values for each processor to get a simple relative measure of the power consumption under “real-world” situations.