Overclocking a i5-2500k on a Z68MA-D2H-B3 Motherboard

Daniel_Adams

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Apr 20, 2017
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I have set the CPU ratio to 41x (4.1ghz) as that's the max my motherboard will let me go, but when i actually go on my PC, and run a stress test it doesn't go over 3.8ghz. I was wondering why it doesn't go near 4.1ghz i have read multiple guides on how to overclock and i have followed them to but still only goes to 3.8ghz
 
Solution
There is a very useful guide on Intel temps, voltages, and overclocking here on the forums: http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

Going by their guide, it is not recommended to go past 1.350V when overclocking your i5-2500K. Not only will this increase temperatures, it would increase the instance of electromigration, degrading the silicon of your cpu die at a faster than expected rate. I would suggest reducing your voltage to 1.350V as a first step just to be on the safe side. You also might want to run prime95 in small FFTs again to check for stability at that lower voltage.

Your fsb appears to be 100, which should yield 4.1GHz if you are using a 41x multiplier. Does CPU-z EVER show that it is...

Daniel_Adams

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Apr 20, 2017
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How do i check the frontside bus frequency?

 

Daniel_Adams

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Apr 20, 2017
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if you mean BCLK/DMI/PEG Frequency I have set that to 100.5Mhz instead of 100Mhz

 

LowlySkeleton

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Aug 5, 2015
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4,860
That looks more like the PCIE frequency. I wouldn't really recommend setting that to 100.5; you should revert it back to 100. This would affect your graphics card and many other things as well.

What I want to know is the Frontside Bus Frequency. This may be called core frequency, bus frequency, or some other name that sounds to do with the cpu and frequency/speed.
 

Daniel_Adams

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Apr 20, 2017
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Okay i will revert that back and look again
 

Daniel_Adams

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Apr 20, 2017
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The Only things I could find with frequency were
CPU Frequency 4.10GHz (100x41)
Memory Frequency 1337.64Mhz (13.33X)


 

LowlySkeleton

Reputable
Aug 5, 2015
235
1
4,860
There is a very useful guide on Intel temps, voltages, and overclocking here on the forums: http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

Going by their guide, it is not recommended to go past 1.350V when overclocking your i5-2500K. Not only will this increase temperatures, it would increase the instance of electromigration, degrading the silicon of your cpu die at a faster than expected rate. I would suggest reducing your voltage to 1.350V as a first step just to be on the safe side. You also might want to run prime95 in small FFTs again to check for stability at that lower voltage.

Your fsb appears to be 100, which should yield 4.1GHz if you are using a 41x multiplier. Does CPU-z EVER show that it is running at 4.1GHz?
 
Solution