> Games on Disc More Energy Efficient than Downloads
http://www.notechmagazine.com/2014/09/games-on-disc-more-ene...
And if you really want to dive into the complications of this topic from a broader perspective of energy use, this piece is full of thought-provoking questions, even if you don't necessarily agree with the conclusions:
http://www.lowtechmagazine.com/2015/10/can-the-internet-run-...