RTL8156 is a USB network card solution with USB 3.1 Gen1 (5Gbps bandwidth) device; RTL8226 is used for routers, switches, etc.
Of course, 2.5Gbps chips are also backward compatible with normal Gigabit and 100M, however,In order to fully load 2.5Gbps (about 325MB / s), in addition to carrier access, network equipment to meet the requirements, you also need to pay attention to deploy Super Category 5 or Category 6 wire.
In terms of supporting support, ASRock has announced that it will add RTL8125 to Phantom Gaming 9/6 Z390 motherboard and form a dual network card with Intel solution. Finally, it will provide three RJ45 network ports, one 2.5Gbps and two standard Gigabit.
Those who think that Gigabit slow, 10 Gigabit expensive fever players can choose 2500 megabytes of transition.