Wi-Fi speeds are slow on the ASUS ExpertBook B9 B9403 even when close to a Wi-Fi 6E router. The Intel Core Ultra 7 155U paired with the Intel Wi-Fi 6E AX211 adapter delivers fast wireless speeds when correctly configured, but Windows 11 power management settings often limit the wireless adapter performance.
Disable Wi-Fi Power Saving
Device Manager → Network adapters → Intel Wi-Fi 6E AX211 → Properties → Power Management. Uncheck “Allow the computer to turn off this device.” Also in Advanced tab set Roaming Aggressiveness to Lowest.
Enable 160 MHz Channel Width
Device Manager → Intel AX211 → Properties → Advanced tab. Set “802.11n/ac/ax Wireless Mode” to the highest available and “Preferred Band” to 6 GHz. Set channel width to 160 MHz for max speed.
Update Intel Wi-Fi Driver
Download the latest Intel Wi-Fi 6E AX211 driver from ASUS Support or Intel. New driver versions often include significant throughput improvements for the 6 GHz band on the AX211.
Verify Router 6 GHz Band is Active
Log in to your router admin panel and confirm the 6 GHz radio is enabled and broadcasting. Some routers disable 6 GHz by default even when marketed as Wi-Fi 6E.
“Disabling power saving on the Intel AX211 and setting 160 MHz channel width tripled my Wi-Fi speed on the ExpertBook B9.” — Kamarulzaman, Cyberjaya
Ryan holds a Computer Science degree and has spent over 15 years troubleshooting Windows hardware and driver issues across major laptop brands. He writes practical, step-by-step guides for everyday users at softwaredriverdownload.com.
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