cpu safe vcore for i7 7700k

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kooiankeen

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Jul 24, 2017
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i m currently running my i7 7700k with all the settings set to auto and i get a max vcore of 1.344 . Is that too high? I havent overclocked it
 
Solution
geofelt
Sounds like 1.28v was not sufficient for your settings.

Start with default settings and run a stress test.
I like OCCT, it will shut down your test if temperatures reach 85c.
Monitor vcore and the multiplier with CPU-Z.

Gradually raise the multiplier for all cores from the default of 42 to a higher number and see how you do.
Stop when you reach your max and back off a notch.
Yes, you can do more sophisticated tweaking, but this works.

The processor will slow down or shut off if it detects a dangerous temperature.
That is around 100c.

When all is done, implement speedstep and adaptive voltage.
That will reduce the vcore and multiplier when there is little to do.

AVX instructions are not common in most apps, but they are used in...
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lumineZ

lumineZ

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Jul 25, 2017
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1.350 is what most common to set as max for high end air cooling with OC. With high end custom water loop you can push 1.400 Vcore but would not run that 24/7.

If you want to run stock with no overclock try setting the Vcore somewhere in the 1.200 - 1.250 range and it will still run stable.

Reason for Vcore to be set high on default is because its not Intel who sets the volts but the motherboard manufacturers and they will set the default Vcore high to ensure that every cpu that gets plugged into the socket will run.
 
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10tacle

10tacle

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Dec 6, 2008
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First, it is always helpful to post your full system specs so everyone is on the same page on what you have instead of assumptions.

Anyway, that is way too high for non-overclock. That kind of voltage would be used for overclocking to say 4.6-4.7GHz (on all four cores). Never use "Auto" settings in the motherboard BIOS. Nine times out of ten it will unnecessarily push too much juice, especially when under load. First try disabling hyperthreading and see what it does about load voltage under auto.

Do you have the CPU voltage offset set to adaptive? That will at least limit voltage during idle/non-load periods like surfing the internet. Otherwise I'd recommend manually setting the voltage to something like 1.25v as that's the average Vcore for that chip stock and keep CPU voltage offset at adaptive mode. If it runs at 1.25v with no blue screen crashes, then gradually dial down the voltage by .025v ticks at a time until you get a crash under load. That's the point where your CPU will no longer run. Then tick it back up to the last .025v change where it still worked.
 
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geofelt

geofelt

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Oct 9, 2006
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Stock settings for I7-7700K are reasonably close to overclock settings.
Your 1.344 is fine.
You can overclock a bit, depending on the quality of your chip.
1.4v is considered ok.
As of 6/9/17
What percent can get an overclock at a somewhat sane 1.4v Vcore.

I7-7700K
4.9 83%
5.0 62%
5.1 29%
5.2 6%

It is the vcore that drives up temperatures. The use of AVX instructions, which Prime95 uses will drive up temperatures unduly. In the bios, there should be an AVX offset setting to reduce the multiplier when AVX instructions are executed.

Implement speedstep and adaptive voltage.
That will reduce your multiplier and vcore when there is little to do.
 
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K

kooiankeen

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Jul 24, 2017
110
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my mobo is asus z170 pro gaming, cooler is id cooling aio water cooler. before that i used offset mode and the max vcore is 1.28. But sometimes when i turned on the computer , the screen will appear as below
"this system has POSTed in safe mode.
This may be due to the previous POST attempt failing because of system instability,
or if the power button was held in to force the system off.
If the system failed to POST after you made changes to UEFI settings,
you may wish to revert to stable settings to prevent POST failure.
Press F1 to Run SETUP"
Btw i shut down my computer properly every time.
Lastly, if my temp is below 80 when gaming, is that fine although with those vcore?
 
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geofelt

geofelt

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Oct 9, 2006
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174,240
Sounds like 1.28v was not sufficient for your settings.

Start with default settings and run a stress test.
I like OCCT, it will shut down your test if temperatures reach 85c.
Monitor vcore and the multiplier with CPU-Z.

Gradually raise the multiplier for all cores from the default of 42 to a higher number and see how you do.
Stop when you reach your max and back off a notch.
Yes, you can do more sophisticated tweaking, but this works.

The processor will slow down or shut off if it detects a dangerous temperature.
That is around 100c.

When all is done, implement speedstep and adaptive voltage.
That will reduce the vcore and multiplier when there is little to do.

AVX instructions are not common in most apps, but they are used in prime95, OCCT and other stress testers.
AVX puts an unusual demand on chip temperatures.
If your bios has a AVX offset setting you could use that to reduce the multiplier when avx instructions are present.

Under normal high use, I would not be alarmed at peaks of 75-80c.
 
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