But a reboot without crashing is only possible up to 3178 MHz. The latest series of the Mac Pro (Mac Pro 3.1) can indeed be overclocked in the ZDNet test up to 3241 MHz while remaining stable. ZDNet Clock is fundamentally "reboot-proof". +The only option for "normalising" the time of the Mac Pro again is to restart without switching off the computer. So videos do not run faster after overclocking.+ Now, you can run UNIX commands to troubleshoot. Release the keys when you see a black screen with white text on it. Press the power button and hold down Command-S as your Mac starts up. After all, multimedia applications use the HPET module. The closest thing you can do is to boot in single-user mode and use the command-line interface to interrogate your Mac using Unix commands.
#Overclock mac pro 3.1 Pc#
+Whereas programmers of the IBM PC XT had to be forgiven for using the bus clock speed because of inadequacies of its Intel 8253 timer module, it should be reasonable to expect more from Apple, who now only offer computers with modern HPET timers.
#Overclock mac pro 3.1 mac os#
Nor does time correction by means of the Mac OS NTP daemon succeed: It simply no longer works with a large discrepancy between the bus clock and real time.+ It is compared with real time when booting up. +Unlike Windows, Linux and many Hackintosh versions, Mac OS uses the bus clock speed as the time source.
One caveat - no performance improvement in Xbench (or other benchmarks) but the article seems to address this and suggests a stop watch to see the real-world performance gains since the Mac clock is tied to the system clock. I've downloaded the app and will post results as soon as I can. Well, they claim you can OC a 2.8GHz mac pro to 3.2GHz safely using this utility.
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