Probably, see numbers for a quad-core AMD in https://forum.openwrt.org/t/comparative-throughput-testing-including-nat-sqm-wireguard-and-openvpn/44724. A 4-core AMD GX-412TC reached 1740 Mbps in a bidirectional RRUL test (no traffic shaper, no PPPoE, just NAT and firewalling), With traffic shaper bidirectional aggregate (up- plus down-load rate) throughput decreases to 700 Mbps (with full MTU packets). So this specific device (an APU2 I believe) will do 1Gbps if NAT and modest firewalling is all that is required.
Other AMD quad-cores will have different performance profiles, i.e. a ryzen3 will probably be better suited.