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The theory, on paper at least, is that a wifi card will negotiate the fastest link speed possible based on signal quality. If its a dual band wifi card, it'll choose 2.4g if it thinks it'll be faster than 5, particularly on dual band mesh systems.
Have you looked at Signal to Noise ratio to get a feel for whether something is interfering? All kinds of things can throw wifi off. Ours shifts down link speed every time our neighbour plugs his Tesla in.
Stonehedge-
I found Windows seems to stick with 2.4GHz regardless once it connects to that. I ticked the:
High Performance Devices: Connect high performance clients to 5 GHz only to on and speed went way up.Maybe a slightly unusual situation in that I can run a few APs so there aren't any distant spots where the 2.4GHz carries but the 5GHz doesn't.
My wi-fi speed of 200-250Mbps seems pretty reasonable now. No idea what was happening previously to cause my network speed to be way lower than my internet speed.
aggi
Are you sure the wi-fi is meant to be gigabit and that's not referring to the ethernet ports. Gigabit speed wi-fi seems optimistic.
One issue I found was lots of laptops defaulted to 2.4GHz connection which was considerably slower.