How do I underclock my cpu ?

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Jared Trader

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Jan 25, 2015
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My cpu runs around 80c under load and I want to under clock it but do not know how. I have a biostar mobo and do not know how to do it.
 
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nukemaster

nukemaster

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Nov 23, 2004
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It would help to know what cpu and board.

Generally you can just drop the multiplier.

I would instead recommend you get to the root of this overheating.

80c under a heavy synthetic benchmark on an Intel cpu would not be that much of an issue because in normal use it would never get that hot.

Check to ensure fans are spinning and that the heatsink is not full of dust.

Another option is to decrease voltage a bit, but this takes time and testing to find a stable voltage.
 
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J

Jared Trader

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My board is a Hi=Fi A70U3P and the CPU is a Kaveri AMD A10-7850K APU. I know the CPU cooler is working and i changed the thermal paste to see if that was the issue. I am not sure how to drop the multiplier.
 
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nukemaster

nukemaster

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Nov 23, 2004
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Strange that your cpu seems to be running at maximum clock speed and yet the voltage is VERY low.

What are you using to read the temperatures? Can you check your system to see if anything is running taking all kinds of cpu power.

This is what an idle looks like normally(Intel and AMD may have different clock rates, but they all clock down when power savings are enabled.).
n50jtu.jpg


As for the multiplier adjustment, That would be in the bios. Something does seem wrong, I do not think those chips get that hot even with the stock cooler
 
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nukemaster

nukemaster

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Nov 23, 2004
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I am taking it that with the low profile cooler you have a small case? What cooler is it and is it rated for 95 watt+ cpus?

I would check the bios temperatures as well because sometimes software is not accurate. Tmpin0 appears to be your boards sensor and may be worth looking at as well.

It also looks like your board is applying rather high voltages under load because I see 1.440V showing as a max. The manual does not show anything about multiplier and minimal voltage control options. It does appear to be able to limit TDP and that would force the clock speeds to not reach the higher levels. You also have custom P-states that may allow voltage changes, but You would have to take care with this for sure.

Best to read the manual to know how to reset the cmos if you make a bad setting that prevents the system from posting.
 
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nukemaster

nukemaster

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Nov 23, 2004
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I have some bad news. I think your temperatures are high because the cpu is overwhelming the cooler.

Noctua has that cooler rated for 65 watt TDP cpus and you are running a 95 watt TDP part
http://www.noctua.at/main.php?show=nh_l9a_tdp_guidelines.

Now you may be able to lower the clock speeds, but your board is a bit different.

Enter the bios by hitting DEL on startup(you may hit it multiple times if needed.)
In the bios select Advanced(near the bottom)
Select CPU configuration.
Make sure Power Now is on
Enable Configurable TDP and see if you can set it to 65.

The bios also has a custom P-state option, but they do not seem to document it well so I do not have the information needed to guide use of that.

Now, can you please post what case you have, maybe a better cooler will fit(even the stock cooler may be better at this point).
 
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nukemaster

nukemaster

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Nov 23, 2004
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It looks to me like you did not need to go with a low profile cooler.

A small tower cooler or a bigger top down cooler may be a better option for system cooling.

This is the kind of case users tend to put smaller coolers in because nothing else fits. This is actually "large" for a small form factor case.
2hej5ts.jpg
 
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