So you are looking for a compact PC for your entertainment center? The ASUS VivoPC K20 has you covered. It is a multi-media focused PC with 4K/UHD support, whisper-quiet operation, and optional discrete NVIDIA or AMD graphics. It also has 2 USB 3.1 ports for faster transfer rates.
The machine runs Windows 10. It is powered by a 7th gen Intel Core processor. You can find the specs here.