Can any computer use 2.4 and 5 ghz?

I need to change the frequency of a router and computer.  can any computer use both frequency?  I know about the router, but not the computer.

Most very recent computers will have wireless cards that use both bands.. if you don't know look up the specs on the computer.
But cheaper end will still be 2.4ghz only. And a lot of older stuff will be 2.4ghz.. because it has better range and is more compatible.

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