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ASUS N55SF throttles cpu when under load in battery mode

Last response: in Laptops & Notebooks
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May 19, 2013 9:26:53 AM

My laptop's 2670QM works just fine under load when on charge (2.2Ghz, turbo to ~2.8) however when I unplug it and run it under load, it runs with no turbo and intermittently drops the multiplier to 8x (800Mhz) after it starts getting hot then back to 2.2 repeatedly . I'm running with the High Performance Profile and have looked over the power options for anything that might be throttling it, cpu max on battery is at 100%, cooling profile is active etc. The NVIDIA 635M card does not throttle.

Any ideas?
May 24, 2013 2:27:51 PM

I'm still stumped on this... I enabled a few extra hidden cpu power settings by editing the registry but none of those are of any use, and disabling throttle states doesn't seem to disable throttle states!

Though I discovered that the problem only happens when the gpu is under load. OCCT works with the frequency constantly at 2.2 Ghz or more.

https://dl.dropboxusercontent.com/u/12239448/load.png

Here's a screenshot of the state of the cpu when running Just Cause 2 on battery. The current % frequency is marked by the blue line in "CPU - Total", it spikes up and down. I couldn't get CPU-Z to work (started crashing after intel graphics update) so I had to use the windows resource monitor. The game music also has stutters.

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a b Ĉ ASUS
a b D Laptop
a b à CPUs
May 24, 2013 3:50:01 PM
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The battery alone is not meant to provide the max TDP the CPU and GPU are capable of. Plus, the battery gets hot as well, which adds to overall system temperature, which can consequently entail throttling - once a particular temperature threshold is hit and exceeded - to ensure the system doesn't overheat.

It's normal for this behavior on battery, even with the proper power scheme settings and application configurations in place. :) 
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May 25, 2013 5:00:55 AM

Prostar Computer said:
The battery alone is not meant to provide the max TDP the CPU and GPU are capable of. Plus, the battery gets hot as well, which adds to overall system temperature, which can consequently entail throttling - once a particular temperature threshold is hit and exceeded - to ensure the system doesn't overheat.

It's normal for this behavior on battery, even with the proper power scheme settings and application configurations in place. :) 


Thank you, I discovered that if I lower the resolution and set a framerate cap of 30 in most games the graphics power used is never enough to cause throttling. The games look sort of pixelated, but at least they work. :p 

a b Ĉ ASUS
a b D Laptop
a b à CPUs
May 28, 2013 4:07:33 PM

Nice! You're welcome, and I'm glad I could provide some info. :) 
!