Question Does the i5-9400F thermal throttle?

May 18, 2021
currently, my temperatures are 45c-66c on idle while gaming its 100c, the main reason for this is the weather 42c in Iraq hell anyways Does the i5-9400F thermal throttle?
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If the cpu is not sufficiently cooled, then yes it will throttle to try and protect itself.

In very hot conditions, if an air conditioner is not available, I would open up the computer case and at least point a room fan into the interior to help remove heat.
currently, my temperatures are 45c-66c on idle while gaming its 100c, the main reason for this is the weather 42c in Iraq hell anyways Does the i5-9400F thermal throttle?
You can run afterburner and configure it to show you the CPU clocks, if it reaches advertised single and maximum all core clocks while gaming then it does not throttle, if it does not reach the correct clocks then it does throttle.

A lot of mobos are preconfigured to run the fans as slowly as possible to keep noise as low as possible so it's completely possible that it keeps the correct clocks even at 100degrees. you can go into bios and check the fan courve.
Intel processors will throttle at 100c.
I expect to see 10-15c. over ambient at idle.
Your idle temperatures are ok.
That tells me that your stock cooler is probably mounted ok.
Check to see that the cooler is not loose, and that all 4 pushpins are through the motherboard and locked.
It can be tricky. See my instructions at the end.

The first thing to do is to see that your cooler is getting sufficient fresh airflow to let it do it's job.
What is your case and fan arrangement?
What is your graphics card?
I would hope for two front 120mm intake fans or better.
If that is not possible, try taking the case side cover off and direct a house fan at the innards.

----------------how to mount the stock Intel cooler--------------

The stock Intel cooler can be tricky to install.
A poor installation will result in higher cpu temperatures.
If properly mounted, you should expect temperatures at idle to be 10-15c. over ambient.

To mount the Intel stock cooler properly, place the motherboard on top of the foam or cardboard backing that was packed with the motherboard.
The stock cooler will come with paste pre applied, it looks like three grey strips.
The 4 push pins should come in the proper position for installation, that is with the pins rotated in the opposite direction of the arrow,(clockwise)
and pulled up as far as they can go.
Take the time to play with the pushpin mechanism until you know how they work.
Orient the 4 pins so that they are exactly over the motherboard holes.
If one is out of place, you will damage the pins which are delicate.
Push down on a DIAGONAL pair of pins at the same time. Then the other pair.
When you push down on the top black pins, it expands the white plastic pins to fix the cooler in place.
If you do them one at a time, you will not get the cooler on straight.
Lastly, look at the back of the motherboard to verify that all 4 pins are equally through the motherboard, and that the cooler is on firmly.
This last step must be done, which is why the motherboard should be out of the case to do the job. Or you need a case with a opening that lets you see the pins.
It is possible to mount the cooler with the motherboard mounted in the case, but you can then never be certain that the push pins are inserted properly
unless you can verify that the pins are through the motherboard and locked.

If you should need to remove the cooler, first run the cpu to heat it up and soften the paste before shutting down and powering off the pc. That makes it easy to unstick the old cooler.
Turn the pins counter clockwise to unlock them.
You will need to clean off the old paste and reapply new if you ever take the cooler off.
Clean off old paste with alcohol and a lint free paper like a coffee filter.
Apply new paste sparingly. A small rice sized drop in the center will spread our under heat and pressure.
Too much paste is bad, it will act as an insulator.
It is hard to use too little.


As geo wrote, about 15C above ambient would seem about normal, more than that may indicate poor HSF mounting.

My own experience with Intel's stock HSF is that they are almost a one-time deal: if they come off for whatever reason after having been on for a couple of years, they never work right again due to the frame's plastic deformation over time.