Pinging the tech gurus that I know...
my tail is still sore from the RCDD exam this morning.
I highly doubt it. Unless it's very unusual, it has two radios, one for 2.4 and one for 5, and neither can operate in the other band.
If your access is OK using the 2.4 ghz network, I wouldn't worry. However, if you are experiencing interference and can't fix it by switching channels in the 2.4 band, then I would go to the 5 ghz band.
I have two networks, one on 2.4 and one on 5. They are served by separate access points. I started out with only 2.4 and had problems with cordless phone interference. So, since my Mac already had 5 ghz capability, I bought an Apple Airport and switched over to that. Problem solved. I've since replaced the cordless phone with a $20 DECT phone that works fine and doesn't bother WiFi. Now I operate both networks, since I do have some devices that are only 2.4 capable, and all are working OK.