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 WHR-HP-G54 vs. Regular End-Users Wireless Routers.

"HP" in the middle of the WHR-HP-G54 model name stands for High Power, it cost about $20 more than similar Wireless Routers.

Regular Wireless Cable/DSL Routers use the chipset for RF Output; these chipsets are designed for an output of 30 to 40 mW.

Most Entry Level Wireless Cable/DSL Routers emit about 33mW.

With a 3rd party firmware you can "OverClock" (Boost the Power) of the chipset's Wireless.  However, since the chipsets were not designed for higher output you “overclock” the noise as well.

See here what Noisy means to Wireless performance, What the Signal Strength Bars mean in Wireless hardware?

Each one of the “overclocked” Wireless Routers has a "Sweet Spot".  I.e. a balance between higher output and reasonable noise.

As an Example, I have a Linksys WRT54G v4 that with 3rd party firmware it is OverClocked to output of 55mW. I can "Overclock" it up to 90mW, but beyond 55mW the output becomes too noisy and there is No benefit from the additional power.

 In the  Buffalo WHR-HP-G54 ,there is a build in RF amplifier that is placed between the chipset output and the Antenna. 

The chipset is deliberately tuned down to provide to the Amplifier only 10mW.

Lower signal at the chipset level provides much cleaner signal that is sent into the final Output Amplifier (HP).

The Amplifier Boost of the 10mW, resultant in 80 to 90mW of clean 2.4GHz signal.

Thus for a little more money, you get 2-3 times stronger and cleaner signal than what you get from a regular Wireless Router. (Beware 2 or 3 times does not mean 2 or 3 times the distance).

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