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Wireless Adapter - Dual Band, 802.11 a/b/g/n/ac, 2.4GHz - 5.0GHz, 300Mbps - 867Mbps, so what does that mean? Does a card adapter like this use two bands at once for a combined speed or is that just stating that one band you get such and such speed and the other one you can get a better speed? If I have a ac router and ac adapter which number do I need to focus on or is it actually a simultaneous speed using both bands?