AC performance WRT3200 on 5G AC

Your notebook probably has 2 aerials, so maximum throughput is limited to 867 mbps link speed (Transmit+Receive) with 80 MHz bandwidth setting when using 802.11ac wifi5.

ie. speed tests will typically max out around 430 mbps for most 2 aerial devices.

You would have to use 160 MHz bandwidth to achieve 800+ mbps over 802.11ac.
https://forum.openwrt.org/t/linksys-wrt3200acm-160mhz-wifi/31238