Macintouch tested the fasted computer running Mac OS X and of course, it is a Hackintosh. Of course, because Apple has always refused to allow overclocking on the Mac.
The computer they tested is more or less the equivalent of a Mac Pro built around a motherboard hosting to Xeon Westmere. THey chose the most powerful processors, two Xeon X5680 running on 6 cores at 3.33 GHz. these processors cost as much as $1700 - each - so Apple limits the Mac Pro at 2.93 GHz. These two processors were then overclocked to 4.2 GHz.
The results are very impressive:
It is truly the fastest computer running Mac OS X. Of COurse, everything is not as simple as on a real Mac, since compatibility can never be perfect. Also to have such processors frequencies, you have to accept a very noisy machine.
Even if it is a very nice technical achievement, we cannot publicly endorse the Hackintosh, even though we continue to think that there would be a market for a computer between the iMac and the Mac Pro that has become too expensive.