The Xbox One features an eight-core AMD Jaguar-based APU SoC with integrated GPU and 8GB DDR3 memory running at 2133MHz. Details about the GPU are slim, just like the PS4 it's a graphics chip based on AMD's GCN architecture but it seems the Xbox One will have a slower version than the PS4. Sony's console reportedly has a peak shader throughput of 1.84 teraflops, whereas the Xbox One delivers only 1.23 teraflops.
The Xbox One is here, and it’s being powered by a single-chip, semi-custom APU co-developed by AMD and Microsoft. bit.ly/12sgn7K— AMDGaming (@AMDGaming) May 22, 2013