Note that, even if your router only supports 100Mbps Ethernet, it's not necessary to replace it to get 1Gbps networking between your PCs. Just get an Ethernet switch box which supports both 1G and 100M (which almost all do), plug all your PCs into the switch, and then connect the switch to the router. Traffic between your PCs will now flow at 1G, while external traffic between the router and the switch will be 100M.
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