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From what I have seen on Youtube videos and from what I have read on the Internet, the undervolt value of the CPU core and CPU cache should be the same.

My CPU is i7-11800h. After running several tests, the stable undervolt value of the CPU core was -100mV; as for the CPU cache, it was -45mV. As you can see, the difference between the core and the cache undervolts is huge.

Is it ok to use those values? How would it affect performance?

If it is not recommended to use those values, is there an acceptable range for the gap between the CPU core and cache undervolt values?

machine_1
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2 Answers2

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It all depends on your CPU. Not the model, but the particular piece you got. Not all CPUs are made equal - some are more flexible when it comes to voltages, other not so much. This is not by design, but due to tiniest variantions in the manufacturing process. The common name for this is "silicon lottery".

The default values have to be quite conservative to work on majority of manufactured products. This means that unless you've had particularly bad luck, there's some room for undervolting. But how much will depend on how lucky you got.

The best way to assess the effect on performance is to measure it. There are too many variables: cooling efficiency, power stability and the luck factor too. Your setup is unique and only your own benchmarking will give you accurate results.

gronostaj
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You may reduce the temperature of the CPU in Windows by :

  • Go to Power Options > Change plan settings > Change advanced power settings > Processor power management > Maximum processor state
  • Set it to 95%
  • Reboot.

This will prevent Windows from using 100% of the CPU and reduce the maximum temperature, but you will hardly feel the 5% difference. If this is not enough, lower it some more.

harrymc
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