Windows 10: Intel Core I7 4790Non-K reaching 60 to 70 Degrees Celsius on idle

Hello, I have an Intel Core I7 4790Non-K processor and it reached 100 Degrees Celsius on idle. So, at first the CPU fan was broken, I replaced it with a newer CPU fan and still I get 60 to 70 Degrees Celsius on idle. Here is a screenshot of it:

:)

 

Task Manager showing Intel Core i5-2500K operating at 5.29GHz??


Intel introduced EIST about a decade ago. It means on idle you are clocking in at the lowest available frequency which in my Core i5-4300u's case is 0.8 GHz. This helps tremendously in saving power especially on laptops and mobile devices. It doesn't harm the performance at all since the CPU will clock back to its normal/overclocked frequency when there's a CPU load. Turbo Boost is Intel's dynamic overclock where the CPU is forced to operate at its TDP in any given CPU load. For example, if you have a dual core CPU, the only way to achieve the TDP limit is to have a full load on both Cores, so running full load on one core while the 2nd core is mostly idle will take approximately 60-70% of CPUs TDP. Therefore, to reach CPU's TDP with only one core loaded, one of the CPU cores must be temporarily overclocked to about 50-150% (depends on the CPU model) to reach that TDP on only one core.

For example, my Core i5-4300U has a normal frequency of 1.9 GHz with Turbo boost to 2.6 GHz on both cores (about ~90% CPU usage on both cores).


EIST enabled
idling at 0.8 GHz, 35 degrees Celsius, 1.5 Watts power use.





Both Cores loaded at ~90% CPU usage
2.6 GHz speed, 73 degrees Celsius core temp, ~15 Watts power use (TDP)

 

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