Question CPU not reaching full speed on Cinebench

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BigHigh

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Sep 20, 2014
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I have an i9-14900f. I would like to stress test the CPU. I ran cinebench and received a multicore score of 20482. However, I noticed the clock speed remains around 2.5ghz. Temps hover around 45C, CPU usage is 100%. How can I get cinebench to run the CPU at its max clock. I would like to ensure this processor is preforming as intended, it is new, I updated the bios to most recent update. Thank you.
 
COLGeek said:
Sounds like it isn't cooking properly. This will cause the CPU to throttle back to protect itself.

That CPU runs hot. Also, is your motherboard BIOS fully updated?
Click to expand...
Yes bios is fully updated. Shouldn't it at least attempt to run the cpu at full speed?
 
@BigHigh

The 14900F has a very low processor base power rating of only 65 Watts.

https://www.intel.com/content/www/u...-5-80-ghz/specifications.html?wapkw=i9 14900f

At default settings, many motherboards will set the long term PL1 turbo power limit to 65W which will cause significant power limit throttling during Cinebench.

Monitor your computer with HWiNFO while stress testing. You are either thermal throttling or you might be power limit throttling.
 
BigHigh said:
MSI afterburner
Click to expand...
Use HWiNFO like I suggested. HWiNFO reports reasons for throttling. Your temperatures are fine so it might show a power limit throttling issue. This information is very useful when trying to track down a low CPU speed problem.

M309ePU.png
 
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BigHigh said:
I have an i9-14900f. I would like to stress test the CPU. I ran cinebench and received a multicore score of 20482. However, I noticed the clock speed remains around 2.5ghz. Temps hover around 45C, CPU usage is 100%. How can I get cinebench to run the CPU at its max clock. I would like to ensure this processor is preforming as intended, it is new, I updated the bios to most recent update. Thank you.
Click to expand...
Intel has the base clock of the 14900f at 2Ghz...you are running at 2.5Ghz, it's running not only as intended but higher than that.

As you can see in your pic it hits 100% of it's available turbo.
You could have a look in the bios to see if the turbo is set to lower that it could but it's a low power CPU don't expect it to run like an overclocked CPU.
 
TerryLaze said:
Intel has the base clock of the 14900f at 2Ghz...you are running at 2.5Ghz, it's running not only as intended but higher than that.

As you can see in your pic it hits 100% of it's available turbo.
You could have a look in the bios to see if the turbo is set to lower that it could but it's a low power CPU don't expect it to run like an overclocked CPU.
Click to expand...
https://imgur.com/a/dqcsJKn
View: https://imgur.com/a/dqcsJKn


Ok, I understand. This is Hwinfo when cinebench was near complete. I just want to make sure the CPU is running at the expected performance and not thermal throttling. I looked up cinebench score for this cpu online and it says 33, 820.
 
@BigHigh

Scroll some more through the HWiNFO data and you will be able to see what the BIOS has set the turbo power limits to. I prefer maximum performance so I deliberately set the PL1 and PL2 turbo power limits high.

B0Hj7JR.png


When your computer is fully loaded, HWiNFO reports, "Core Power Limit Exceeded". The CPU is power limit throttling. That means it is slowing down so it does not exceed Intel's 65W Processor Base Power spec.

The BIOS of your motherboard should allow you to set the turbo power limits however you like. If you are interested in more performance and if you have adequate cooling, you can increase the turbo power limits. This will allow the CPU to run significantly faster before power limit throttling begins.

No one in any forum can accurately predict the long term reliability of your CPU. If you are worried that increasing the power limits might damage your CPU, leave the turbo power limits at their default values.
 
uWebb429 said:
@BigHigh

Scroll some more through the HWiNFO data and you will be able to see what the BIOS has set the turbo power limits to. I prefer maximum performance so I deliberately set the PL1 and PL2 turbo power limits high.

B0Hj7JR.png


When your computer is fully loaded, HWiNFO reports, "Core Power Limit Exceeded". The CPU is power limit throttling. That means it is slowing down so it does not exceed Intel's 65W Processor Base Power spec.

The BIOS of your motherboard should allow you to set the turbo power limits however you like. If you are interested in more performance and if you have adequate cooling, you can increase the turbo power limits. This will allow the CPU to run significantly faster before power limit throttling begins.

No one in any forum can accurately predict the long term reliability of your CPU. If you are worried that increasing the power limits might damage your CPU, leave the turbo power limits at their default values.
Click to expand...
I see my PL1 is set to 65W and PL2 is set to 219W. I don't mind leaving the preset limits, I just wanted to make sure my CPU is up to par during a stress test. Does this setting just limit the amount of power the CPU draws? So if you set a higher baseline limit, the CPU will run at a faster base speed?
 
@BigHigh

Increasing the long term PL1 turbo power limit will let your CPU use more turbo boost. The CPU will run almost 100% faster when it is fully loaded. Try setting PL1 = PL2 = 219 in the BIOS. Boot up and run Cinebench again. You should see a much better score, especially if you do a full 10 minute test. If the CPU is only running at 47°C during a full load stress test then obviously 65W is way too conservative to set the long term power limit to.

The 14900F is physically identical to a 14900K which has a 253W power limit. The 65W power limit is mostly for marketing purposes. AMD sells low power CPUs so Intel needs to do the same. Selling low power CPUs makes Intel's big corporate customers like Dell, HP, etc. happy.

When a CPU goes down the assembly line, if it is a really good CPU, Intel will set a high default power limit and sell it as a 14900K. If it is not a top tier CPU, Intel reduces the power limits and sells it as a 14900F. Intel deliberately leaves the power limits unlocked on all of their CPUs so consumers can choose to set the power limits however they like. The engineers are well aware that limiting a high performance CPU to only 65W is a travesty. That is about the same as shoving a potato in the exhaust of one side of a Corvette.
 
uWebb429 said:
@BigHigh

Increasing the long term PL1 turbo power limit will let your CPU use more turbo boost. The CPU will run almost 100% faster when it is fully loaded. Try setting PL1 = PL2 = 219 in the BIOS. Boot up and run Cinebench again. You should see a much better score, especially if you do a full 10 minute test. If the CPU is only running at 47°C during a full load stress test then obviously 65W is way too conservative to set the long term power limit to.

The 14900F is physically identical to a 14900K which has a 253W power limit. The 65W power limit is mostly for marketing purposes. AMD sells low power CPUs so Intel needs to do the same. Selling low power CPUs makes Intel's big corporate customers like Dell, HP, etc. happy.

When a CPU goes down the assembly line, if it is a really good CPU, Intel will set a high default power limit and sell it as a 14900K. If it is not a top tier CPU, Intel reduces the power limits and sells it as a 14900F. Intel deliberately leaves the power limits unlocked on all of their CPUs so consumers can choose to set the power limits however they like. The engineers are well aware that limiting a high performance CPU to only 65W is a travesty. That is about the same as shoving a potato in the exhaust of one side of a Corvette.
Click to expand...
Thank you for explaining this in detail. I was able to find the Pl1 and Pl2 settings in my bios. However, it says they are set to auto.
 
uWebb429 said:
@BigHigh

Increasing the long term PL1 turbo power limit will let your CPU use more turbo boost. The CPU will run almost 100% faster when it is fully loaded. Try setting PL1 = PL2 = 219 in the BIOS. Boot up and run Cinebench again. You should see a much better score, especially if you do a full 10 minute test. If the CPU is only running at 47°C during a full load stress test then obviously 65W is way too conservative to set the long term power limit to.

The 14900F is physically identical to a 14900K which has a 253W power limit. The 65W power limit is mostly for marketing purposes. AMD sells low power CPUs so Intel needs to do the same. Selling low power CPUs makes Intel's big corporate customers like Dell, HP, etc. happy.

When a CPU goes down the assembly line, if it is a really good CPU, Intel will set a high default power limit and sell it as a 14900K. If it is not a top tier CPU, Intel reduces the power limits and sells it as a 14900F. Intel deliberately leaves the power limits unlocked on all of their CPUs so consumers can choose to set the power limits however they like. The engineers are well aware that limiting a high performance CPU to only 65W is a travesty. That is about the same as shoving a potato in the exhaust of one side of a Corvette.
Click to expand...
https://imgur.com/a/I1FtQg5
View: https://imgur.com/a/I1FtQg5


This is with the Pl1 set to 200w. It looks like there definitly is thermal throttling. Average temp was mid 80s. With unsustained spikes in 90s. Cinebench 34273 multi core and 2226 single core.
 
Last edited:
BigHigh said:
I ran Cinebench and received a multicore score of 20482.
Click to expand...

BigHigh said:
Cinebench 34273
Click to expand...

A 67% increase in your Cinebench score is impressive. Your CPU could probably run a little faster with better cooling. Most users are not aware that one simple adjustment of the PL1 long term power limit can increase performance so much.

Intel states that core temperatures under 100°C are "safe operating temperatures" for their CPUs. That is why they set the default thermal throttling temperature to 100°C.

If you do not feel comfortable running your CPU at such high temperatures, lower the PL1 power limit value to somewhere between 65W and 200W. You should be able to do this in the BIOS or you can use software like ThrottleStop or Intel XTU to change the power limits while you are in Windows. You do not need to reboot when you want to make a change to the turbo power limits.

crSSSS4.png
 
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