I don't really worry about the cost, I need the fastest internet speed possible. Any other recommendations are welcomed.
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More aboutwireless network speed
If you have a dual band N range router, try get a wireless adapter for your PC that supports the 5ghz band.
It might not make much of a noticeable difference, but if you want the best possible speeds then getting off the 2.4ghz band would be preferable. So far the 5ghz band isn't as widely used, as such there's less interference from other wireless devices.