ZDNet.de has posted a new tool called ZDNet Clock Tool 1.0 for Mac Pro which allows you to overclock your Mac Pro. The process of overclocking uses software to increase your computer's processor speed and bus speed, potentially leading to higher performance. Boost the speed too high, however, and the computer may crash as either the processor or some of their components are unable to keep up. Still, ZDNet.de claims to have achieved some impressive results:
ZDNet uses three Mac Pros as test machines. One comes from the first Intel/Mac Pro generation (Mac Pro 1.1) with 65-nanometer processors and 1333-MHz front side bus. The others come from the third generation with 45-nanometer processors and 1600-MHz front side bus, as sold by Apple since January 2008 (Mac Pro 3.1). The first computer is equipped with two 2.66 GHz X5355 processors, and runs stable at 3.10 GHz, see figure 2. The other two have two 2.80 GHz E5462 processors. These can be overclocked up to 3.24 GHz and remain stable, see figure 1.
The multi-page article (be sure to click on 'weiter' for next pages) describes their results including stability tests over 24 hours. There are a few caveats as well:
If you carry out benchmarks such as Cinebench or Geekbench after overclocking, the benchmarks do not indicate any improvement in performance at first. But if you resort to a stopwatch, the higher performance resulting from overclocking can indeed be verified. You also notice that the system clock runs significantly faster after overclocking the computer.
Rebooting (but not shutting down) reportedly corrects this timing issue on all but the 1st generation Mac Pros. More details are available in the article. The application is available for free download from ZDNet.de (click on "Jetzt herunterlade" to download). Some MacRumors readers have already had some experience with this tool, but readers should proceed with caution (see potential disadvantages in overclocking, in general).
Update: Versions for other Mac models are expected in the future, and simply shutting down your Mac and turning it back on will reverse the effects of the overclocking application.
