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So Windows 8 specs are 1GB ram minimum for OS on 32-bit system. Xbox is not running a full version of the Windows 8 OS, however even in a hyper-V environment you need the entire OS for each instance, each requiring separate resources. With the Apps, games and video pass through all functioning at the same time, it is pretty reasonable to say that 3GB will be required for OS alone. Remember, everything is displayed in HD including the menus, a lot is going to be constantly going on in the background on at least two hyper-Vs. I would imagine that the HDD hits will need to kept to a minimum in order to keep performance up as well, which also lends itself to having more available ram for the various hyper-vs being run.

http://www.engadget.com/2013/05/21/xbox-one-runs-three-operating-systems/