The Extreme4's onboard extras consist primarily of a power button, a reset button, and a two-digit status code display. We also find a Thunderbolt upgrade card header and a PCIe 3.0 x4 M.2 connector, both of which have become fairly common on mid-priced Z170 motherboards. http://www.tomshardware.com/reviews/asrock-z170-extreme4-atx-motherboard,4337.html
The Extreme4's onboard extras consist primarily of a power button, a reset button, and a two-digit status code display. We also find a Thunderbolt upgrade card header and a PCIe 3.0 x4 M.2 connector, both of which have become fairly common on mid-priced Z170 motherboards. http://www.tomshardware.com/reviews/asrock-z170-extreme4-atx-motherboard,4337.html