how to change 2.4 Ghz to 5Ghz?

[Univers123]

when I am on wireless mode it for me it doesn't show me the ac it includes: a, b, g, b/g, a/g and a/b/g. What do I choose???

I saw a video you can change it by using ac, I don't know if my laptop support 5 Ghz and maybe thats why my wifi crashes for 10 seconds. 

So what should I choose?

[banhien]

@Univers123 

I don't know what is your machine but If your machine was

(a) built before mid 2014 the chance to upgrade to a wifi card which supports 5.0GHz networks is very slim to none due to the whitelist in BIOS. Options

                https://www.pcgamer.com/au/best-usb-wi-fi-adapter/

(b) built from late 2014: it may only has one antenna therefore very you can get aifi card for 5.0GHz but the signals are limited. Please try

           https://www.amazon.com.au/Intel-7260-HMWG-R-Wireless-AC-Network-Adapter/dp/B00MV3N7UO

Regards.

[Univers123]

I choose prefred band to 5G first, I don't know if I will crash. 

And yes my wifi card is Realtek 802 ac PCIe Adapter I just dont have ac on the wireless mode. I don't know how to use 5 G only.

[banhien]

@Univers123 

All AC wifi adapters will broadcast TWO (dual) bands (2.4GHz and 5.0GHz), you can select only 5.0 GHz SSID to connect.

Regards.

[Univers123]

How do I stop getting wifi 999 ms in a video game for 5 second or 10? I thought this was the problem but I dont know how to fix this.

[Univers123]

What should I choose, I am guessing this is the problem why my wifi always stop working for 5 seconds