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Old 07-25-2006, 12:54 PM   #1 (permalink)
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I read on howstuffworks that the operating system slows down the CPU when the computer is not in use. do you guys know how much does it slow down by

say e.g. if one has a 1.5 GHz processor, does it slow down to 1 GHz, i guess the clock dividers must be getting reconfigured
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Old 07-25-2006, 01:11 PM   #2 (permalink)
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on my particular centrino 1.6Ghz, the cpu slows down to 800MHz when idle or simple word processing. i dont know about others tho
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Old 07-25-2006, 02:37 PM   #3 (permalink)
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I think thats Intel Speedstep Technology.
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Old 07-26-2006, 04:41 AM   #4 (permalink)
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there are several different technologies that do this going all the way back to AMD's K6 series, i think speedstep uses several different ratios depending on what is required but with Cool n' Quiet and most of the time it is halved
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Old 07-26-2006, 05:31 AM   #5 (permalink)
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aha

thanks for the replies guys
so most of the mobile processors, have an automatic sensing of idle periods and when they go into idle mode then they half the processor speed, correct?

with speedstep, what are the other ratios used for?
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Old 07-26-2006, 05:34 AM   #6 (permalink)
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it depends on the system. my dad's Laptop has a Pentium 4 1.6, which throttles down to 1.2 when it is on batteries, and sometimes drops to over 800MHZ when the battery is low.
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Old 07-26-2006, 07:35 AM   #7 (permalink)
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thanks for the reply

so when a laptop is used whilst using batteries, it actually is operating at a lower frequency to save power?

how does one check the cpu speed at a particular instant
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Old 07-26-2006, 08:44 AM   #8 (permalink)
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again, it depends on the laptop.

to check the CPU speed, right click My Computer, and go to properties.
or download and run CPU-Z
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Old 07-26-2006, 09:06 AM   #9 (permalink)
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thanks for the reply

i did right click My Computer -> properties.
my desktop says 2.6 GHz, with a laptop would this be variable depending upon the mode it is in? or would it show the max speed of the processor?
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Old 07-28-2006, 12:56 PM   #10 (permalink)
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my notebook has an intel centrino proccessor that runs at 1.7ghz max. but if its just idle then its around 760mhz. i have heard of it being called speedstep technology or just stepping. the new core 2 duo's also have stepping technology to save power for notebook computers.
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