Indeed, only 10W are provided, but still, even the best MXM boards use up to 100W, just a fraction compared to similar desktop parts. However, the biggest problem for now seems to be compatibility; MXM boards have too little (see: expensive) market segment to be developed in bulk and according to strict specifications. Only yesterday I received this e-mail from HWtools: "I got several inquiries about MXM. However, because there are many issues of MXM in mechanism and compatibility that will take us a lot of time to overcome. So far we don’t have any plan for developing."