Find and check a wireless network label or sticker on your laptop. The Wi-Fi standard is written there. It indicates which capability your wireless card has.
- 802.11b/g/n (or "bgn") --> your card supports 2.4 GHz band only. There is no way to activate 5 GHz without you buy new "Wi-Fi stick" having 5 GHz support.
- 802.11a/b/g/n (or "abgn" or "abg") or 802.11ac --> your card is 5 GHz capable. Only laptop card setting change should be needed to enable 5 GHz radio.
The "a" means the 5 GHz.
For wireless standard logo types see a picture on this link:
Wireless Ethernet 820 11a To 820 11g Network Basics Networking Basics LAN...
Use any dual-band cell phone (Samsung Galaxy S4, S5, S6...) and free WiFi Analyzer Android application to check your router is transmitting 5 GHz too (channels 34 and higher).
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