PB 12" Proc Speed Discrepancy

macosxhints - Display your CPU's true speed:

"I ran Xbench on CPU test only and after several dozen tries, got an average of about 98.3 (It varies slightly). I than shutdown my powerbook, and reset the PMU. When I started it back up and logged into my special account and did a sysctl hw.cpufrequency test again, this time it said my CPU was running at 866MHz. Much better. I then ran Xbench again, and guess what. I got the EXACT same scores. Somewhere around 98.3. So, what does this tell me? sysctl doesn't tell you anything. Ignore it."

I'm glad some people are reasonably empirical.