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Wireless Adapter 802.11ac Dual Band real speeds?

I recently upgraded my internet service and I have had some issues with my 6 year old modem and router so I upgraded to a Motorola SB6141 and a Linsys AC900 EA6200.

Now I am looking for a good wireless adapter to go with the networking. I looked at some cards that say s they are
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?

Thanks,
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REIUSA
Asked:
REIUSA
1 Solution
 
Darr247Commented:
> 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
The latter.

A router is capable of the former, if more than one device is connected to it (one to the 5GHz 11ac band and another to 11n on the 2.4GHz band).

That's really going to affect only your Local Area Network (LAN) transfers, because even 802.11b's maximum connection speed will saturate the average 6Mbps or less internet connection.
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