[Ti] On restart cpu reduces from 867mhz to 566mhz (Longish-please clip for reply)

John Griffin jwegriffin at mac.com
Tue Dec 30 09:26:45 PST 2003

OK, I got this from the following link:


Here is one person's testing results:

Authored by: ahbe on Thu, Dec 4 '03 at 12:40PM

Ok listen up, this should answer many of your questions. Here's my setup:
867Mhz 12" Powerbook OS X Panther 10.3.1 Xbench 1.1.3 I created a new
account just for this test. This is mostly because my primary account has a
bunch of stuff running in the background, and I wanted to make this as
subjective as possible. So, after a fresh restart I logged into my newly
created account and did a sysctl hw.cpufrequency and got back an answer of
533Mhz like everyone else. 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. In fact, just restarting my computer, not reseting the PMU, will give me
different answers when I do a sysctl hw.cpufrequency. Sometimes I get
533MHz, sometimes I get 866MHz. So, at least on my 12" Powerbook, it doesn't
matter. Any perceived speed increases are just in your head. Hope this
helps. -- Ahbe

So, it appears that some Powerbooks (1 Ghz Powerbooks and 12" Aluminium
books in particular) return an incorrect value in Terminal and other similar
UNIX utilities.


More information about the Titanium mailing list