VCORE won't change

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Speedster

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Dec 10, 2015
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Motherboard: Z170X-Gaming 3
BIOS: F20 (the latest).

I'm trying to overclock my I7-6700K (for the first time) and it is ridiculously won't even pass Prime95 with ~4.3GHz.
It turned out, however, that no matter what will I set for VCORE in the BIOS, it won't be changed in practice. When i'm going back to the BIOS my settings is saved there, but when booting up the system it shows (HWMonitor) 'VID' jumping between 1.25V to 1.35V in full load.
I saw a lot of people recommend switching to fixed or manual mode, but i don't see these options in my BIOS.
Any suggestions?
 
Solution
S
VID is that the cpu request for voltage, vcore is what voltage the cpu is actually receiving.
Look at vcore readings, not VID.
Make sure you using prime95 v26.6 or simply use AIDA64 or ASUS Realbench.
With gigabyte, you simply type in the voltage you want it at at the core voltage box for manual mode.
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Suztera

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VID is that the cpu request for voltage, vcore is what voltage the cpu is actually receiving.
Look at vcore readings, not VID.
Make sure you using prime95 v26.6 or simply use AIDA64 or ASUS Realbench.
With gigabyte, you simply type in the voltage you want it at at the core voltage box for manual mode.
 
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Solution
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Speedster

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Oh, thanks.
What voltage would you recommend for 4.7-4.8GHz with Corsair H100i GTX?
 
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Suztera

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Whatever voltage your cpu is stable at for 4.7Ghz and how high the temperature you want the cpu at.
Since your VID is between 1.25v-1.35v for 4.3Ghz, it unlikely you would even hit 4.7ghz without overvolting within advised limits.
Start with 1.3V and see what Ghz your cpu is stable at 1.3V.
 
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I managed to get (probably) stable 4670Mhz with 1.44V with average of 85C.
I'm trying to decide whether max cooler capabilities, leave the voltage as it is, and trying to push for 4700Mhz OR lower the voltage for around 1.4V and the frequency for ~4500Mhz.
 
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Speedster

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Thank you very much, you've really helped me!
By the way, after I was playing with it for a while, I find out that my i7 6700K will never be stable with 4.7Ghz, even with maximum cooling and 1.445V. Probably blue screen after 10 minutes. However, with just 100Mhz less (~4.6Ghz) and only 1.35V, I got no blue screen for more then half an hour. I should test it for some more hours to be sure, but I think it is stable, or at least close to be. So how - with that less voltage and only 100Mhz less frequency - the results are so different?

By the way I forgot to mention, English is not my first language so I probably was mistaken here and there.
 
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Suztera

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Silicon lottery. Not all i7 6700k are the same. 4.6ghz at around 1.35v is from an average yield for an i7 6700k.
 
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Speedster

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OK. And last question: I set VCORE for 1.35V but now it shows less then 1.35V while idle and under 1.3V while full load.
 
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Speedster

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Yeah but VCORE is higher when around 10-20% load then when under full load. Is it normal, too?
 
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