1st Flex IO (top side) - choose one of the following options: 1 Dual SuperSpeed USB Std-A 5Gbps, 1 Dual SuperSpeed USB Type-C® 10Gbps , (1) 1GbE NIC, (1) 1Gbps Fiber LC NIC , (1) 2.5GbE NIC , (1) 10GbE NIC , USB-based Serial port option; 2nd Flex IO (bottom side) - choose one of the following options: 1) 1GbE NIC, (1) 2.5GbE NIC , Serial port option, External Power Button, HP Remote System Controller