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Prime95 FFT triggering throttling issue

Prime95 FFT triggering throttling issue

C
Catnixs
Junior Member
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12-25-2016, 08:45 PM
#1
Hey there,
Running my 6700K with Gameboost and XMP activated in the BIOS of my motherboard (MSI Z170A Gaming Pro Carbon), which sets the multiplier to x44 and gives a 4.4 Ghz clock speed, is stable. However, during the prime95 test I observed the clock dropping to 3.9 Ghz when performing the FFT test. It looks like the multiplier simply decreases.
https://imgur.com/zEZTSvK
View: https://imgur.com/zEZTSvK
Initially I suspected thermal throttling, but temperatures remain well below the limit (70°C max).
Then I discovered some flags that were triggered in HWInfo (see image).
What might be causing this? I’m certain it’s some built-in motherboard protection I don’t want to turn off, just to confirm if it’s unusual.
During intense (but simulated) tasks like Battlefield V or other games, I don’t see multiplier drops.
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C
Catnixs
12-25-2016, 08:45 PM #1

Hey there,
Running my 6700K with Gameboost and XMP activated in the BIOS of my motherboard (MSI Z170A Gaming Pro Carbon), which sets the multiplier to x44 and gives a 4.4 Ghz clock speed, is stable. However, during the prime95 test I observed the clock dropping to 3.9 Ghz when performing the FFT test. It looks like the multiplier simply decreases.
https://imgur.com/zEZTSvK
View: https://imgur.com/zEZTSvK
Initially I suspected thermal throttling, but temperatures remain well below the limit (70°C max).
Then I discovered some flags that were triggered in HWInfo (see image).
What might be causing this? I’m certain it’s some built-in motherboard protection I don’t want to turn off, just to confirm if it’s unusual.
During intense (but simulated) tasks like Battlefield V or other games, I don’t see multiplier drops.

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B
BunnyFucker
Member
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172
12-26-2016, 03:29 PM
#2
Heavy tasks that engage every core will lower clocks to the base frequency, which should be 4 GHz for the 6700K...
If your MSI motherboard supports MCE, all cores can reach maximum turbo (4.2 GHz) during load... but temperatures will rise by 4-8°C depending on the cooler and the core voltage applied by the motherboard... (6700K requires about 0.05V less core voltage than 7700K at stock clocks if memory settings are correct, though for aiming for 4.6 GHz or higher, a similar 1.25V core voltage might be needed)
Intel's Extreme Tuning Utility lets you safely increase the multiplier in 1x steps to test, especially if your cooling is solid—typically you'll find around 300-600 MHz of overclocking headroom, which many 6700K users enjoy... (In case of a crash or blue screen, XTU will revert everything back to the default settings)
My own 7700K managed to reach 4.7 GHz with the standard 1.248V core voltage and stays under 70°C under normal conditions, while the 6700K performed similarly to the 7700K
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B
BunnyFucker
12-26-2016, 03:29 PM #2

Heavy tasks that engage every core will lower clocks to the base frequency, which should be 4 GHz for the 6700K...
If your MSI motherboard supports MCE, all cores can reach maximum turbo (4.2 GHz) during load... but temperatures will rise by 4-8°C depending on the cooler and the core voltage applied by the motherboard... (6700K requires about 0.05V less core voltage than 7700K at stock clocks if memory settings are correct, though for aiming for 4.6 GHz or higher, a similar 1.25V core voltage might be needed)
Intel's Extreme Tuning Utility lets you safely increase the multiplier in 1x steps to test, especially if your cooling is solid—typically you'll find around 300-600 MHz of overclocking headroom, which many 6700K users enjoy... (In case of a crash or blue screen, XTU will revert everything back to the default settings)
My own 7700K managed to reach 4.7 GHz with the standard 1.248V core voltage and stays under 70°C under normal conditions, while the 6700K performed similarly to the 7700K

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