I bought it as an used unit from Amazon to replace the NUC6i5SYH. The 2-ft HDMI cable and Samsung 4k monitor were the same from the previous NUC. However, when I booted to Windows 10, the screen was flashed every 3-5 seconds. Intel HDMI firmware was updated but the problem was still existed. I knew this problem caused by weak HDMI signal from the NUC. The cable was replaced with a higher quality one (larger gauge wires), the problem was disappeared.Overall, it is a silent and fast NUC, Intel Core i5-8259U.