http://www.asrock.com/mb/Intel/Z170%20Extreme4/?cat=Specifications
6x SATA-600 / 3 x SATA Express (Gen2, 10Gb/s)
M.2 (S600/PCI-e 3.0 x4)
3x PCI-e 3.0 x16 connectors, with:
• Single x16
• Dual x8 / x8
• triple x8 / x8 / x4
3x PCI-e 3.0 x1
NIC: Intel I219V
4x USB 2.0
8x USB 3.0
USB 3.1 (Gen2, 10Gb/s)
USB 3.1 (Type-C, G2, 10Gb/s)
DisplayPort 1.2
PS/2
Dual firmware