Generally, a router that states it's 802.11a/g/n, or 802.11ac will work at
5GHz. However, a router that is
802.11b/g/n has a slim chance of
supporting that frequency, and you may need to upgrade. If your router
supports 5GHz connectivity, the next thing to
do is to check your adapter.
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In basic terms, 802.11n is faster than 802.11g, which itself is faster than the earlier 802.11b. ... Among its key innovations, 802.11n adds technology called multiple-input multiple-output (MIMO), a signal processing and smart antenna technique for transmitting multiple data streams through multiple antennas.