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Why does my CPU throttle itself?

post #1 of 16
Thread Starter 
316

Supposed to be at 1.33GHz, but when under full load, it throttles itself down to ~666MHz, even though temperatures are safe (~50C).

This is not a gaming laptop or anything:
Intel i5 U470 @ 1.33GHz
4.00GB, with 3.79GB usable (rest is used by onboard graphics) RAM
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post #2 of 16
go to your control panel and check your power options, there in processor options > minimum state - change it to 100%.
your laptop just saving power like that to increase battery life span.
post #3 of 16
what is generating the full load?
It seems weird that it would throttle at full load

There are settings in the BIOS that throttle down you're in idling but not during load.
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post #4 of 16
Thread Starter 
Quote:
Originally Posted by Slavkoza View Post

go to your control panel and check your power options, there in processor options > minimum state - change it to 100%.
your laptop just saving power like that to increase battery life span.

It's under high performance, which when plugged in, is already set at 100% for minimum state.
Quote:
Originally Posted by dmanstasiu View Post

what is generating the full load?
It seems weird that it would throttle at full load
There are settings in the BIOS that throttle down you're in idling but not during load.

Anything that requires it, really, from video rendering, to multi-tasking, to watching 1080p movies; it always throttles down to around that much. It's really annoying...

In BIOS, there's literally no settings to control this; everything is locked out.
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post #5 of 16
What are the temperatures when it's at 1.3GHz and at full load (i.e. before it throttles down)?
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post #6 of 16
There are usually "Cooling Settings" of some sort in the Advance Power Management options. Try the various settings, see which works best.

2nd option, download ThrottleStop, install it, use it to force the clockspeeds.
 
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post #7 of 16
Thread Starter 
Quote:
Originally Posted by jrbroad77 View Post

2nd option, download ThrottleStop, install it, use it to force the clockspeeds.

Thank you; that did it. Time to customize the options of those so I can control this throttling! =D
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post #8 of 16
The 470UM processors are designed to turn off Turbo Boost when you reach a pre-defined power limit. When you fully load your CPU, you exceed this power limit and end up with zero Turbo Boost so your CPU is left running at its default clock speed which for a 470UM is 1.33 GHz.

If CPU-Z reports less than that, your CPU might be using some form of clock modulation throttling which slows your CPU down internally. ThrottleStop reports the multiplier separate from clock modulation throttling so you can see exactly what is going on.

The best part about ThrottleStop is you can use it to force clock modulation so your CPU runs at 100% and you can also increase your Turbo Power limits so Turbo Boost stays fully active even when your CPU is fully loaded.

There is a big thread over at Notebook Review that talks about using ThrottleStop in the Dell Alienware M11x-R2 laptops that used these UM CPUs.

http://forum.notebookreview.com/alienware-m11x/524257-how-supercharge-m11x-core-i5-i7-um-cpus.html

The performance increase is over 50% in some cases and if your CPU is also being throttled with clock modulation throttling, the performance increase could be greater than that. Run 4 threads of the wPrime benchmark to get some before and after ThrottleStop results.

ThrottleStop 4.00
http://www.techinferno.com/downloads/

wPrime
http://www.wprime.net/Download/

You might need to hold the Shift key down when wPrime first starts. There is a bug in the hardware detection stage on some laptops and this will bypass that.

Some ThrottleStop screen shots.
http://www.softpedia.com/progScreenshots/ThrottleStop-Screenshot-163602.html
Edited by unclewebb - 3/3/12 at 9:44am
post #9 of 16
Thread Starter 
Quote:
Originally Posted by unclewebb View Post

The performance increase is over 50% in some cases and if your CPU is also being throttled with clock modulation throttling, the performance increase could be greater than that. Run 4 threads of the wPrime benchmark to get some before and after ThrottleStop results.

Yup; using 32M TS Bench with 4 threads with no modification of the settings, it took about 3 minutes to complete, where with turboboost active at all times (with powersaver on so it can throttle down when not being used), it went down to ~40 seconds (comparatively, with turboboost off and just 10 multiplier, it took about ~60 seconds).

Very happy with these results; going to have it run with no turboboost as default for AC power (10 multiplier), run it as "default" (locked to 5 multiplier) when on battery power, and keep the performance setting with turboboost when I want that extra power.

Question:
When I run benchmarking to see if it actually works, the multiplier for turboboost varies from 11 to 16, going all the way up to 2.0GHz+; that seems a little dangerous >.>. Is it supposed to be doing that? It stables at 12 (at ~1.6GHz), but like I said, it jumps all the way to 16 occasionally. Is that just the sensor screwing up?
Edited by nyforever - 3/3/12 at 12:30pm
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post #10 of 16
There is a setting for cooling if its set for passive cooling it will downclock the cpu before it spins the fan up faster. You need to set it to active, my girlfriends laptop with a i3 21xx cpu and dont have that problem.

Passive- decreases cpu speed before increasing fan speed (so not to kill the battery faster)

Active- Will increase fan speed before it decreases cpu speed
 
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