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This thing is a beast: "The K Computer, built by Fujitsu, currently combines 68544 SPARC64 VIIIfx CPUs, each with eight cores, for a total of 548,352 cores—almost twice as many as any other system in the TOP500. The K Computer is also more powerful than the next five systems on the list combined."

Interesting that they use the Sparc. I would also have guessed there would be more commercial/private companies in the Top10.

Japan supercomputer Kei is capable of 8 Petaflops/second. I wonder how if it could be used for mining Bitcoins... How much would it make in US$ per day...
It would probably lose money considering the massive power bill; the FPUs and interconnect wouldn't be used at all.
http://www.top500.org/site/systems/3189

A "Web company" has 13 systems in the top 500. My first guess is Amazon, but anyone have any other guesses?

Google?
hmm, wouldn't guess Google because I thought while their computing grid is the most powerful it's not really a supercomputer because it's just tons and tons of basic machines... but maybe
Doesn't Google custom-built their own computers? As vendor there is HP listed.
I looked at the top six and they all use Linux. Huh.
The raw list: http://www.top500.org/list/2011/06/100