If we did not report procedures or information related to CPU overclock since the Intel CPU transition, it does mean we stopped investigating new possibilities.
Of course with Apple adopting the EFI, it is more difficult to modify CPU or FSB voltage; however one can still overclock Mac Pro Xeon via Windows as shown below. You can simply use SysTool allowing you to directly modify the clock generator:
SysTool can even force the clock generator to change its frequency without rebooting. As shown below, the Mac Pro generator is identified as an ICS932S401.
With SysTool and Apple memory modules we successfully overclocked the FSB from 333 x 4 (1333MHz) to 380 x 4 (1521MHz).
The test machin
