The speed of the WiFi using three antennas now on wireless n 450mbps, of course no one will get these speeds so in other words its rubbish.
Wireless is ALWAYS about theoretical speeds, not actual. The real world makes it impossible for it to hit the theoretical speeds because of obstacles, humans and not working in a vacuum.
I get 120-140Mbps between hosts with my Time Capsule. That's honestly not bad for any wireless technology. Additionally, the new iMacs and MacBook Pros have MIMO support which is also supported by the existing simultaneous dual-band Time Capsules -- realistically that should be good for another 20-40Mbps boost.
The new routers also have six antennas instead of three, so we may see increased throughput on both the 2.4GHz and 5.0GHz bands. They've also improved heat dissipation, power consumption, and reduced noise. Honestly, if I could get 200Mbps over MIMO on the 5GHz band, I'd be very happy with that as a wireless technology.
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