<P> The original Xbox One's exterior casing consists of a two - tone "liquid black" finish; with half finished in a matte grey, and the other in a glossier black . The matte side of the top of the console consists of a large air vent . The design was intended to evoke a more entertainment - oriented and simplified look than previous iterations of the console; among other changes, the LED rings used by Xbox 360 are replaced by a glowing white Xbox logo used to communicate the system's status to the user . Due to the overall ventilation design of the console, the original Xbox One is designed to only sit horizontally . </P> <P> Xbox One is powered by an AMD "Jaguar" Accelerated Processing Unit (APU) with two quad - core modules totaling eight x86 - 64 cores clocked at 1.75 GHz, and 8 GB of DDR3 RAM with a memory bandwidth of 68.3 GB / s . The memory subsystem also features an additional 32 MB of "embedded static" RAM, or ESRAM, with a memory bandwidth of 109 GB / s . For simultaneous read and write operations, the ESRAM is capable of a theoretical memory bandwidth of 192 GB / s and that a memory bandwidth of 133 GB / s has been achieved with operations that involved alpha transparency blending . The system includes a non-replaceable hard drive and a Blu - ray Disc optical drive . 138 GB of hard drive space is used by the operating system, with the remainder available for the storage of games . Since the June 2014 software update, up to two USB drives can be connected to Xbox One to expand its capacity . External drives must support USB 3.0 and have a capacity of at least 256 GB . </P> <P> It was reported that 3 GB of RAM would be reserved for the operating system and utility software, leaving 5 GB for games . With DirectX 11.2 as the console's API, the graphics processing unit (GPU) is based on an AMD GCN architecture with 12 compute units, which have a total of 768 cores, running at 853 MHz providing an estimated peak theoretical power of 1.31 T FLOPS . For networking, Xbox One supports Gigabit Ethernet, 802.11 n wireless, and Wi - Fi Direct . </P> <P>--Greg Williams, GM of Xbox silicon development </P>

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