Apparently the LinITX 8" used 10W max and the 7" is similar to the Lilliput and Xenarc at about 8-10W so i would say around the same. But i would estimate around 15W when you do your power budget calcs. I used to hate doing power and mass budgets in systems lectures but now doing a real system with real unknowns and tight margins it is really useful. Basically get a good estimate and then assign a % error. eg 50% for a totally new product, 5% for a mature product etc.