REAL Webserver Hardware Requirements

I've been curious as to how low I could go with webserver hardware spec and still have a "snappy" sub-1 sec response web server, primarily serving PHP/MySQL pages to about 500 simultaneous users.

Assuming an optimized Gentoo Linux install, what would be the threshold where server response goes from sub-1 second to 1 second plus? Now what if we bump 500 down to 250?

-= SsZERO =-

 

 

 

 

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