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Chances are, your "5 GHz" router would still support the 2.4GHz channels. You just have to make sure that in the router config, it is broadcasting in both 2.4 GHz and 5 GHz (you'll most likely be setting up 2 WiFi networks with different SSID's), and you are good to go.
Also, assuming that your network setup is still using wireless N networking (as your Intel network card seems to suggest), I don't think there is any speed difference between 2.4 GHz and 5 GHz. It's just that there is far fewer interference at the 5 GHz band (most notably, your microwave oven doesn't use 5 GHz).
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