i7 9700K has two-DIMM slots, two USB 3.1 Gen 2 Type-A ports (10 Gbps), four Thunderbolt 3 (up to 40 Gbps), and a 2.5G Ethernet port.i5 8600k has two DIMM slots, four USB 3.1 Gen 1 ports (5 Gbps), four Thunderbolt 3 (up to 40 Gbps), and a 2.5G Ethernet port.