Question i9 9900k stability issues when intel turbo boost enabled.

Oct 21, 2021
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Hi hope someone is able to help, so I have a i9 9900k CPU with an MSI MPG Z390M Gaming Edge AC motherboard and 40gb of DDR4-2400 installed, 2x 16gb + 1x 8gb sticks, now I keep getting memory errors when testing the ram with memtest86 (the bootable USB version) I have narrowed it down to the following two options, if I disabled "Intel turbo boost" and "enhance turbo" the system works without any memory errors and boots into freash installation of win10 without giving an "uncorrectable error" blue screen when window is starting up.

I have tried leaving the turbo boost and enhance turbo enabled and trying single memory sticks and even different memory still no success, I also tried the CPU in a Asus ROG STRIX z370-g and getting the same errors so I know it's the CPU, but why does it work perfectly when turbo is switched off, I tired setting the ring ratio to stock 3.60Ghz bit still getting the errors when turbo is enabled.

I'm thinking maybe the auto voltage is not keeping up with the Intel turbo boost overclocking or something, it has no issues with the enhanced Intel speedstep technology left enabled as long as I turn off the turbo any advice
 
Oct 21, 2021
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I have tired the memory sticks individually on my my Asus Rog z370 gaming board with a i7 8400 and all of them passed memtest86, they also pass on the i9 system when turbo is disabled.
 

Phaaze88

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https://www.tomshardware.com/reviews/msi-mpg-z390-gaming-edge-ac-micro-atx-motherboard,6005.html
*Sees the following:
The MPG Z390M Gaming Edge AC’s voltage regulator cooling is only sufficient for Core i9-9900K at stock speed...
Voltage regulator is under-cooled for heavy Core i9-9900K loads...

https://www.tomshardware.com/reviews/asus-rog-strix-z370-e-gaming-micro-atx-motherboard,5787.html
While testing was done here with an 8700K instead, the VRM was also found to get toasty when pushing it. Likely to be worse with a 9900K.

So far, you've installed the 9900K in boards that weren't really beefy enough for Enhanced Turbo, or operating it above stock power limits.
Also, don't mix ram. That's always a gamble. Just run it without that lone stick.

why does it work perfectly when turbo is switched off
When you take your time to finish a test, you're less likely to make mistakes, but when you go all gung-ho through it...
Something like that, I would imagine.
 
'Enhanced turbo' is motherboard manufacturer specific. It's not a standard (Intel or otherwise), and usually entails the motherboard giving the CPU waaaay too much voltage in order to atain very high clock speeds.
Either your CPU or VRM is not able to handle this voltage at the temps you are getting. Your memory controller is ON YOUR CPU and is failing - that is why you see memory errors.

Back off all your overclocks, overvolts, timings adjustments and read through this guide - https://forums.tomshardware.com/faq/cpu-overclocking-guide-and-tutorial-for-beginners.3347428/
 
Reactions: Phaaze88
Oct 21, 2021
4
0
10
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https://www.tomshardware.com/reviews/msi-mpg-z390-gaming-edge-ac-micro-atx-motherboard,6005.html
*Sees the following:
The MPG Z390M Gaming Edge AC’s voltage regulator cooling is only sufficient for Core i9-9900K at stock speed...
Voltage regulator is under-cooled for heavy Core i9-9900K loads...

https://www.tomshardware.com/reviews/asus-rog-strix-z370-e-gaming-micro-atx-motherboard,5787.html
While testing was done here with an 8700K instead, the VRM was also found to get toasty when pushing it. Likely to be worse with a 9900K.

So far, you've installed the 9900K in boards that weren't really beefy enough for Enhanced Turbo, or operating it above stock power limits.
Also, don't mix ram. That's always a gamble. Just run it without that lone stick.


When you take your time to finish a test, you're less likely to make mistakes, but when you go all gung-ho through it...
Something like that, I would imagine.

Which motherboard would you recommend for the i9 9900k?
 
Oct 21, 2021
4
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'Enhanced turbo' is motherboard manufacturer specific. It's not a standard (Intel or otherwise), and usually entails the motherboard giving the CPU waaaay too much voltage in order to atain very high clock speeds.
Either your CPU or VRM is not able to handle this voltage at the temps you are getting. Your memory controller is ON YOUR CPU and is failing - that is why you see memory errors.

Back off all your overclocks, overvolts, timings adjustments and read through this guide - https://forums.tomshardware.com/faq/cpu-overclocking-guide-and-tutorial-for-beginners.3347428/

How do I upload photos? I know enhance turbo is a motherboard specific function that clocked all cores equally when Intel's turbo boost is enabled, that's why I've left it off and only enabled"Intel's turbo boost"
 

Phaaze88

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Which motherboard would you recommend for the i9 9900k?
Things have obviously changed, but back then, one of the cheapest boards that could handle the 9900K OC'ed or with power limits raised/removed was Gigabyte's Z390 Gaming X.
It does need a little airflow over the VRM area do to so, but it can do it - basically, stick with an air cooler, or use one of those AIOs with a VRM fan on it. For boards with beefier VRMs, this isn't necessary.

Hard to recommend anything without knowing what options are available to you.
 

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