Speedstep for Celeron CPUs. I got 20% extra battery life.

As first pointed out by user Tilleroftheearth, Crystal CPUID has a function that you can enable by holding F4. It somehow down clocks my Celeron SU2300 and gives me over an hour of extra battery life.

Does this work for other Celeron CPUs as well? If so please report and mention what Celeron CPU you have.

Update: also tested this on Celeron 723 and works too. I had to press F4 many times though.

Screenshot: http://i609.photobucket.com/albums/tt179/Vantage72/Cel723.png

 

Does it lower the voltage when you do this as well?

 

I don't think it does.

 

Just a note...

You can lower the voltage with Crystal CPUID, look in the function menu for the option Intel Enhanced SpeedStep and make sure you click the Enable Change Voltage button.

Also, just leave the highest multiplier available for your notebook (I haven't found a way to change voltages for multiple multipliers with CPUID). I also changed my Windows Power setting to High Performance, so that it would always use the lowest voltage I specified. Haven't had a chance to do more testing yet to see if I could further optimize it yet.

Phil, thanks for the recognition ... would be interested to see how much longer your notebook lasts if you can adjust the voltage down.

As a side note, it didn't matter what voltage I put my VAIO P8400 to - it would not go lower than 1.00 V as reported by CPUz; so I wouldn't waste time trying different voltages - pick the lowest one supported and see if it works for you! (Hope I don't make your computer crash. ).

Cheers!

 

Thanks Tiller. I am quite aware of how undervolting works. But the Celeron 723 is locked at 1.138 V.

Neither Crystal nor RMClock can change it.

 

Phil,

Have you tried it?

The voltages reported here are significantly lower:

See:
http://ark.intel.com/Product.aspx?id=36685

 

Yes I've tried it. I'll post a screenshot.

 

Then it must be your MB, not the CPU that is limiting it.

 

I don't know, it's MSI X340 notebook.

The Celeron SU2300 in my DM1 seems to be stuck at one voltage too.

Here's the screenshot of the X340: http://i609.photobucket.com/albums/tt179/Vantage72/shot.png

 

So no one tried this yet?

I thought this would be big news... speedstep for Celerons.