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Power brick is outside the case because of cooling. They designed the console to be on 24/7 365 so they went with large case that has tons of vents 2 of 3 that can be blocked at any one time. A huge fan that takes up 1/3 of the case. Lower power Ram that runs a bit cooler and power supply outside the case to not introduce any further heat. Remember, the orginal Xbox 360 had issues with heat so they over designed the Xbox One to compensate and ensure that would never be an issue again.

 

John