re: What router should I buy?

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I thought ASUS used something they'd branded as "Radar" which is mostly to do with power amplification, maybe with some implicit beam forming. Most of this is done to enhance the inherently lower coverage that the 5GHz band provides. Even still, implicit beamforming on its own simply means it will enhance downstream throughput (marginally, at best, and only relevant to local network connection) and doesn't enhance the signal strength.

On another subject, the whole beamforming marketing is part of what gives people that placebo effect about AC routers having a stronger signal, since explicit beamforming is now part of the standard. Truth be told, the people without AC clients buying 3x3 MIMO AC routers for "future proofing" are doing no such thing. Explicit beamforming itself has room for improvement, and 4x4 MU-MIMO routers, like the upcoming AC87U, will be the first proper upgrade for "future proofing." And really, that's still only for people in big houses and high-traffic local networks.

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You sound very educated on this matter, yet I'm hardcore ethernet so all I heard was blah blah blah wireless interference sucks I'm running gigabit ethernet