Kindly be noted: 1, the i7 5th generation cpu is available to i7-5500u or i7-5550u dual core 4m cache. I7-5500u: Base frequency: 2.4ghz, max. Turbo frequency: 3.0ghz, intel hd5500 graphics, i7-5550u: Base frequency: 2.0ghz, max. Turbo frequency: 3.0ghz, intel hd6000 graphics, it will be shipped with any one of them at random. 2, this mini pc works with ddr3l ram at 1.35v instead of normal 1.5v. 3, the default operating system is windows 10 pro, please leave a message in your order to remind me if you need others, optional: Windows 7, 8.1, Ubuntu. 4, it has been tested well before shipping, if any questions, please contact us, you will get a satisfied solution. Product advantages: 1. Special: 64 bits computing, turbo boost technology 2.0, 15w tdp cpu, support wake-on-lan, calls on function automatically, sata and msata hdd supported, 3*msata3 slot, up to 512g ssd and 1tb hardisk large capacity, support max 16gb ddr3l ram, 2 ram slot, i/o port: 2*hdmi, 2*nic, 1*spdif output port, 4 usb*3.0, 4*usb2.0, 1* sd card slot 2. Stable: Intel broad well +intel hd 5500 graphics +finless 3. Smart: Fanless system, smart design, zero noise, work 24hrs stable working 4. Smooth: Support 3d games, blue-ray and hdmi 4k hd streams, full 1080p playback 5. Strong: Intel i7 5th generation dual core cpu, 4m cache, 16gb ram, 256gb ssd, fast speed. Application: - Used as htpc(home theater personal computer). Connect hdtv with the hdmi cable, enjoy education online and play internet movies or games. -Used as personal computer, high configuration and fast speed, zero noise. - Internet bar. High speed gigabit Ethernet, support 3d games. - Factory, bank, supermarket, manager rooms, library, reading room, hotel, training, call center, cctv company.