1300Mbps capable card (and router) limited to 866Mbps

Have a Comfast Model CF-924AC V2 (1300Mbps capable, dual-band and 2 high-gain antennas) bought at affordable price off Amazon.

The issue that even in forced usb 3.0 mode (per the readme) and even after reboot, I am limited to a max of 866Mbps. The Router is Linksys WRT3200ACM running OpenWRT , and Macbook pro is connected to same router at 1300Mbps, but the server with the USB Wifi mentioned , which is sitting right by the router and closer to it than the Macbook, is only getting max 866Mbps up/down link according to the status page of the associations list in OpenWRT.

afaiu, 866Mbps is 2x2 MIMO, while 1300Mbps is 3x3 MIMO.

what gives?

# uname -a
Linux nas 6.2.9-1-pve #1 SMP PREEMPT_DYNAMIC PVE 6.2.9-1 (2023-03-31T10:48Z) x86_64 GNU/Linux

# lsusb -t
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 10000M
    |__ Port 5: Dev 2, If 0, Class=Vendor Specific Class, Driver=rtl88x2bu, 5000M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M
    |__ Port 11: Dev 2, If 0, Class=Vendor Specific Class, Driver=rtsx_usb, 480M

# lsusb
Bus 002 Device 002: ID 0bda:b812 Realtek Semiconductor Corp. RTL88x2bu [AC1200 Techkey]
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

The server with the usb wifi in openwrt router associations list

vs. the Macbook

RinCat / RTL88x2BU-Linux-Driver

1300Mbps capable card (and router) limited to 866Mbps #190