>>
> We're nearly at the GHz limit for processors; I don't know the exact
> figures, but anything beyond 5GHz seems to be it. Certainly the power
> consumption & heat dissapation is a big problem. Intel are shipping
> multi core monsters, not faster single cores.

As of 2011, the Guinness World Record for the highest CPU clock rate is
an overclocked, 8.805 GHz AMD Bulldozer-based FX-8150 chip. It surpassed
the previous record, a 8.670 GHz AMD FX "Piledriver" chip.[3]

As of mid-2013, the highest clock rate on a production processor is the
IBM zEC12, clocked at 5.5 GHz, which was released in August 2012.

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