Xbox Series S design leaked, Confirmed at $300 this Holiday (Series X = $500)

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I think a lot of the GPU/bandwidth disparity will be solved by the fact that PS5/XSX will be expending a lot of their juice to hit (or try to hit) 4K, while the Series S won't have this pressure and like Switch's portable mode will be able to get away with a lot through opting for much lower resolutions.