i came across this bug in another forum from back in november. the 867mhz G4 is commonly running at 533mhz... but there is a fix, there are some real downsides and i'll get to that later but first.. <pasted from other forum> This is with the 867MHz model (the first one). In Terminal, type the following: sysctl hw.cpufrequency Odds are, you will see that your CPU is running at 533MHz, not 867. This is with the processor set to "Highest," etc. The only work-around we know about so far is: 1. Shutdown. 2. Reset power manager (shift-control-option-power; hold 5-10 seconds). 3. Start up. 4. Launch Terminal and test. RESTARTING or SHUTTING DOWN (and not resetting the power manager) makes the problem appear again. <end paste> now the downsides are A) you have to do this shift-control-option-power thing each time you turn on your computer from being off and B) i've noticed that whenever i do this, while it does give me back my 867mhz, it also reverts my Mac's clock to December 1969... even if i had the time set locked. and it appears as unlocked when i open it. this really sucks. sure you can set the time back easily with apple-automatic-time adjust, but if you arent on the interenet and are on the road somewhere and need to use iCal, this can be a REAL pain in the butt. now i dont know if this is just a bug and the computer is actually running at 867mhz when terminal says 533mhz. i'll try to run some benchmarks and see if there are any noticable differences when terminal reads these these two different speeds. and perhaps other users will do so as well. hopefully that is the case and we wont have to do this 4?-finger salute all the time and then reset the clock. ugh.