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I got an Intel Core i5-12400F that boosts all the cores to the maximum boost frequency which is 4.4GHz (4390MHz as shown) when the CPU is IDLE. But under any load all the cores get instantly capped to 4GHz (3990MHz as shown).

One would think that the CPU is doing that because of the temps, but that's absolutely not the case because I got a giant Thermalright Peerless Assassin 120 on this thing (The maximum temperature that this CPU has ever reached under full load was 51 degrees Celsius, and that was during summer).

So my question obviously is: How come the CPU is boosting itself to the MAX FREQUENCY of 4390MHz ACROSS ALL CORES WHEN IDLE, but gets stuck at 3990MHz UNDER LOAD (Gaming, Cinebench, etc.)

- Power plan is set to High Performance

- Motherboard is an ASUS PRIME B760 PLUS D4 (I didn't notice any power limiting in the BIOS)

 

Some might say "why would you freak out about 400MHz that's not a big deal". But trust me, if I told you about the GPU I got paired with that... 🥲

 

Help a confused man.

Temps.PNG

Under any load.PNG

Idle.PNG

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4 minutes ago, baRii said:

- Power plan is set to High Performance

There you go. That'll force it to max speed at idle.

Reduction under load is likely power limit, check reason in something more complete like HwInfo.

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2 minutes ago, Kilrah said:

There you go. That'll force it to max speed at idle.

Reduction under load is likely power limit, check reason in something more complete like HwInfo.

This

What happens at idle is that each core is used only a few % of the time, and only some cores are in use, then it can go full speed

On full load all cores have to work @100% and you end up being power or thermally limited

Ryzen work like this on default

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8 minutes ago, Kilrah said:

Reduction under load is likely power limit, check reason in something more complete like HwInfo.

image.png.36172cc52ae952c5ac7058d6018e7319.png

I'm assuming this is the power limiting you mentioned ? Is there any way to get rid of it ? I could use those extra clock speeds in games (I'm kinda desperate lol)

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8 minutes ago, PDifolco said:

 

On full load all cores have to work @100% and you end up being power or thermally limited

 

Yeah it looks like it but I couldn't find any indication in the BIOS or any option that allows me to get rid of any kind of power limitation (especially when I have A LOT of thermal headroom)

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7 minutes ago, baRii said:

Yeah it looks like it but I couldn't find any indication in the BIOS or any option that allows me to get rid of any kind of power limitation (especially when I have A LOT of thermal headroom)

I don't know very well how Intel non K chip work, but I suppose you can't increase PPT much

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7 minutes ago, MiszS said:

12C on a core? Does bro live in the arctic

Well do I have news for you. I actually live in Africa hahahah (I'm not trolling 😁)

The cooler that I have installed is an overkill for that CPU. But I was planning on getting a more powerful CPU in the near future (so I was basically future-proofing by getting that cooler)

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14 minutes ago, baRii said:

Well do I have news for you. I actually live in Africa hahahah (I'm not trolling 😁)

The cooler that I have installed is an overkill for that CPU. But I was planning on getting a more powerful CPU in the near future (so I was basically future-proofing by getting that cooler)

Yeah but what is your ambient temp? 

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on full load almost no cpu will boost to max... so it seems indeed normal to me.

 

also hwmonitor isn't reliable at all, often showing phantasy numbers, recommend to install hwinfo64. 

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4 minutes ago, Mark Kaine said:

on full load almost no cpu will boost to max... so it seems indeed normal to me.

 

also hwmonitor isn't reliable at all, often showing phantasy numbers, recommend to install hwinfo64. 

Okay but at least 1 or 2 cores on max frequency, I don't think it's impossible especially with that much thermal headroom.. I believe that's a pretty normal scenario that I've seen with my older CPUs and everywhere.

As for the temps reported by HWMonitor, all the tools that I've used show the same temps so I wouldn't worry about that.

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33 minutes ago, baRii said:

Multiple tools show the same temps (HWMonitor, Core Temp, HWinfo64)

then the sensor is bugged

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1 hour ago, MiszS said:

12C on a core? Does bro live in the arctic

cold ambient? besides the point.

31 minutes ago, baRii said:

Okay but at least 1 or 2 cores on max frequency, I don't think it's impossible especially with that much thermal headroom.. I believe that's a pretty normal scenario that I've seen with my older CPUs and everywhere.

Yeah that died a few generations ago. Now Intel uses favored boost system where it only boosts 1 or 2 cores as a main thread where most of the process are done with the other handling things in the background. 

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3 minutes ago, SorryBella said:

cold ambient? besides the point.

Yeah that died a few generations ago. Now Intel uses favored boost system where it only boosts 1 or 2 cores as a main thread where most of the process are done with the other handling things in the background. 

Well, that explains it then. Time for me to rest and stop messing with the power plans and BIOS.

Thank you.

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