Console OS Memory Usage

"Xbox One hosts 8GB or DDR3 RAM, but it reserves 3GB of them for Operating System and background applications. On the other hand, PlayStation 4 allows games to use an entire 8GB of high speed GDDR5 RAM while reserving 256MB of DDR3 for Operating System and background applications. Now that Kinect has become optional, it is possible for Microsoft to optimize Xbox One OS and reduce its memory footprint, but it will always lag behind PS4 in terms of memory speed and size available for games."

Crytek US Engine Business Development Manager Sean Tracy

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