Dual Band Wifi on new laptop or upgrade

  blagger 23:35 14 Apr 15

I am looking to buy a new/second hand laptop, it needs to have dual band wifi or alternatively I should be able to install a dual band wifi card in it. Having looked at new dual band laptops with a fairly decent spec I may want to go for an older spec laptop which could save me money.

So what I need to know is how can I check if a certain laptops wifi card can be changed to a dual band one without having the laptop with me. What do I need to look for and where? Can you change the wifi cards on all laptops?

Also am I right in saying that for new laptops that state "802.11a/b/g/n/ac" or "802.11ac" are the dual band ones (ac being the keyword)?

The reason I am looking for a dual band wifi laptop/card is because when I am round my parents house, who have a virgin router, the 2.4ghz connection is always disconnecting, however devices on the 5ghz connection always seem to be stable. Thanks

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