The move to Intel processors brought along many hardware similarities with their now PC brethren. One advantage not always available in PPC Macs is overclocking. Previously overclocking often involved unsoldering and soldering transistors or timing crystals on the motherboard. This, unsurprisingly, created the CPU upgrade market.
Overclocking has been a staple in the PC world nearly since the beginning. Motherboards are often judged on their ability to be overclocked. ZDNet (Germany) has the first such tool for the Mac Pro. All done in software, it is an easy way to boost memory frequency, front side bus and CPU speeds:
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.
All PPC Macs are not left out in the cold. If your Mac has an ATI video card, such as a Radeon 9800 Pro or a Radeon X800 XT or before, there is ATIccelerator II. The big advantage over the previous Graphiccelerator is that ATIccelerator does not flash the video cards ROM. Only the latest Radeon X1600 and X1900 cards are not supported.
ATIccelerator II can change ATI graphics cards frequencies live, on-the-fly, under Mac OS X. It’s much more sophisticated and convenient to use than Graphiccelerator for the following reasons:
* no potentially dangerous flashing required
* no cumbersome three-steps process (dump, modify, then reflash ROM)
* no need to reboot for every frequency change
* no OS 9 required (that’s right, G5s and other recent OS 9-free Macs are now supported!)