A 20 petaFLOPS per second PC.

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What's a petaFLOP?
sorry about the question, but i am interested.

No problem, FLOPS is an acronym meaning FLoating point Operations Per Second,
so 1 petaFLOP would be 1 qaudrillion - (1,000 Trillion) FLoating point Operations Per Second if my mathematics is correct.

So as you can imagine, 20 petaFLOPS per second would be just a phenomenal
amount of processing power.

It is explained much better here though:

http://en.wikipedia.org/wiki/FLOPS

I'm just trying to imagine what PC's with the processing power into exaFLOPS, zettaFLOPs and yottaFLOPs would be like?
But that would probably be realized within 30-70 years maybe.