With RT-AC86U pair with ASUS USB-AC53 Nano? What the max speed? Really can be 450?

RT-AC68U supports combined dual-band data rates of up to 1900Mbps. 1300 Mbps 802.11ac at 5 GHz gives Gigabit wireless data rates, while Broadcom® TurboQAM™ technology super-charges 2.4 GHz 802.11n performance from 450 Mbps to 600 Mbps with compatible devices.