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This is a companion question to Can you disable the 5GHz band on a Wi-Fi card (specifically Intel 6200)?

For testing and troubleshooting purposes how to disable the 2.4 GHz band on a Wi-Fi card on Windows?

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Reset to default
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The procedure is pretty much the same as described here. It applies to Intel drivers (Intel(R) Wireless-AC 9560 160MHz specifically in my case), but I assume it is similar for other providers.

First a quick reminder of Wi-Fi standards and bands:

| Gen     | Standard | Band            |
| ------- | -------- | --------------- |
| Wi-Fi 1 | 802.11b  | 2.4 GHz         |
| Wi-Fi 2 | 802.11a  | 5 GHz           |
| Wi-Fi 3 | 802.11g  | 2.4 GHz         |
| Wi-Fi 4 | 802.11n  | 2.4 GHz / 5 GHz |
| Wi-Fi 5 | 802.11ac | 5 GHz           |

To disable the 2.4 GHz band we need to disable the standards that use it:

  1. Device Manager » The wireless card » Properties » Advanced Tab
  2. 802.11a/b/g/n Wireless Mode set to 5GHz 802.11a
  3. 802.11n/ac Wireless Mode set to 802.11ac

There is another option Preferred Band which you can set to Prefer 5GHz band, but I don't know what exactly it does and if it is necessary to change it when all the protocols that use the 2.4 GHz are already disabled.

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    For me preferred band alone didn't help, but this did so far. The options are misleadingly named. The first option 802.11 a/b/g mode seems to actually control what modes are used on 2.4GHz despite the labels, and since "a" is 5GHz setting this seems to disables all the 2.4GHz modes.
    – thomasrutter
    Commented Jun 7, 2021 at 23:57

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