Intel Core i5 stuck at 800mhz

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chopstxnrice

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Sep 7, 2009
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I have a Samsung Series 7 ultra 740U
Processor: intel core i5-3337UU @ 1.8ghz

I opened up cpu-z and discovered it's running at 800mhz.

Tested under load using prime95, switched battery profile to high performance and made sure minimum processor state is 100% on both battery and outlet; also switched to outlet. I went into bios (samsung's bios) and disabled the cpu power saving feature (I forgot what its called exactly).

Attached is a screenshot of cpu-z under prime95 load, with laptop plugged in and running under "high performance" battery profile. Thanks in advance everyone!

5jSQ9X0.jpg
 
Solution
GustavoVanni
Try pressing Fn+F2 (I don't know exactly what function key it its, but should be one with a fan blade drawing)
I had this issue with a Samsung laptop with an i3 CPU that was always "stuck" at 1 GHz even when encoding x264 video.
Then when I pressed Fn+Fsomething its starts spinning the fan and jump the CPU to 2.4 GHz on all cores!
But every time I restart Windows it went back to that low energy state again.
I guess Samsung think we don't need all the horsepower our CPU has to offer.

Sorry my for my english...
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GustavoVanni

GustavoVanni

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Nov 28, 2013
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18,565
Try pressing Fn+F2 (I don't know exactly what function key it its, but should be one with a fan blade drawing)
I had this issue with a Samsung laptop with an i3 CPU that was always "stuck" at 1 GHz even when encoding x264 video.
Then when I pressed Fn+Fsomething its starts spinning the fan and jump the CPU to 2.4 GHz on all cores!
But every time I restart Windows it went back to that low energy state again.
I guess Samsung think we don't need all the horsepower our CPU has to offer.

Sorry my for my english...
 
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Solution
C

chopstxnrice

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Sep 7, 2009
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Such a simple fix. Fn+F11 (fan blade) worked. Nothing happened when I hit it (fan didn't start spinning) but cpu-z showed a jump to 1.8ghz. Thanks!!

 
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jokejong

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Dec 11, 2013
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For me Fn+F11 (fan blade) did change the power plan configuration on the windows, but it didn't help change the speed of the processor. Processor is still stuck at 800mhz.

I am running windows 8 though. Any differences?

This occurrence also happens only after the pc wakes up from hibernation..
 
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GustavoVanni

GustavoVanni

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Nov 28, 2013
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Maybe in your case it is a driver issue, try to reinstall all intel drivers for your setup. (chipset, graphics, etc...)
Hope it helps.
 
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F

Fatum_22

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Sep 29, 2016
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1,510
I had same problem with cpu stuck at 800Ghz. Solved by watching one video.
Actually i downloaded "ThrottleStop" and just take of mark from "BD PROCHOT" and save.
Hope it will help to someone :)
 
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