i7 8700k voltage

[PresidentMike]

Hi Guys,

 

So I finally got my i7 8700K which ran at 100 degrees celcius (because of ASUS Multicore Enhancement) at first finally working at around 70-80 degrees while under heavy load in Aida64. Although that still looks like a high temperature to me. Also the voltage's, Vcore's seem a bit high to me. What do you guys think I can do to run the CPU cooler under these heavy loads?

I've uploaded some pictures to see what's happening with my temp's and voltage at the moment. On the last pic are my settings at default on the ASUS ROG Strix Z370-F motherboard.

 

 

[Himommies]

What CPU cooler 

[Minbari]

Those voltages are not particularly high and those temps are well within the safe range. I suppose you could try manually lowering things to reduce temps at high load, but there isn't really a reason for it at your current levels. If that's a major concern though, potentially an investment in better cooling would probably benefit you? a 240mm AIO? 

[McHox]

sounds like your cooler isnt up to the task,maybe take a look at a undervolting guide

[PresidentMike]

I got an 240mm AIO. The NZXT Kraken X52. 

[Cyracus]

4 minutes ago, McHox said:

sounds like your cooler isnt up to the task,maybe take a look at a undervolting guide

 

4 minutes ago, PresidentMike said:

I got an 240mm AIO. The NZXT Kraken X52. 

well, the 8700k isn't exactly known for being a cool chip... 

[gbergeron]

1.328 VCCIO voltage by default auto ???? Why so high ?

 

Same for SA and Stand by voltage...

 

Never been that high in 7700k or 6700k mobo bios

[PresidentMike]

2 minutes ago, Cyracus said:

 

well, the 8700k isn't exactly known for being a cool chip... 

Is it? Ahh maybe that explains it. I own a i5 3570k and that's one hell of a cool chip. Overclocked to 4.6Ghz and in Aida64 under load Max 61 degrees celcius, air cooled by a CM Hyper Evo 212.

Just now, gbergeron said:

1.328 VCCIO voltage by default auto ???? Why so high ?

 

Same for SA and Stand by voltage...

 

Never been that high in 7700k or 6700k mobo bios

I don't know? These are the default settings.... 

[gbergeron]

Just now, PresidentMike said:

Is it? Ahh maybe that explains it. I own a i5 3570k and that's one hell of a cool chip. Overclocked to 4.6Ghz and in Aida64 under load Max 61 degrees celcius, air cooled by a CM Hyper Evo 212.

I don't know? These are the default settings.... 

Asus with the default settings...zzz... guess its fine tho..

 

8700k runs hotter than 7700k so had to expect these kind of temps, between 70-80 on load is fine tho

[reptileexperts]

Change your voltage to adaptive auto - open XTU and start undervolting with NO overclock applied. Push it til it crashes then add back .01 V
and start to stress test it and see if it's stable. Then start increasing voltage and increasing core count for an overclock if thats what you want. If not, enjoy cooler temps at base clocks. My asus board set m default volts to run around 1.35, Found out I'm stable at 1.2v 4.8ghz  . . and 1.35 for 5.0ghz.

 

[For Science!]

Agree with @reptileexperts, Set it to adaptive mode with a negative offset. Your Vcore (1.264) is the same as my 5.0 GHz on the 8700K.

[PresidentMike]

Thanks for all the quick reply's guys.

 

This is what it looks like now. From now on I have to use Intel XTU in Windows right?

[reptileexperts]

No, you can hard code it in the offset voltage instead of "auto" you can input the value you find stable inside of XTU. Or you can monitor that voltage, then hard volt it.

[PresidentMike]

4 minutes ago, reptileexperts said:

No, you can hard code it in the offset voltage instead of "auto" you can input the value you find stable inside of XTU. Or you can monitor that voltage, then hard volt it.

What would be a save voltage to start with?

[reptileexperts]

anything since you're going lower, you want to track your voltage as you undervolt to find the stability point. Then record that voltage and increase it by .01 to give you some cushion. TheN you can plug that in.

[PresidentMike]

So basically, the best thing I can do is lower the Offset voltage with Intel XTU and then change it in the BIOS?

[reptileexperts]

yep.

[For Science!]

I had problems on my Z370-I to get the Vcore reflect the value I put in. In the end to get to 1.264 Vcore I put in 1.255 V for the "Additional Turbo Mode Voltage" and 0.03 for the "offset voltage".

 

In your case I suspect you can go much lower since you are at lower frequencies.

[reptileexperts]

4 minutes ago, For Science! said:

I had problems on my Z370-I to get the Vcore reflect the value I put in. In the end to get to 1.264 Vcore I put in 1.255 V for the "Additional Turbo Mode Voltage" and 0.03 for the "offset voltage".

 

In your case I suspect you can go much lower since you are at lower frequencies.

Don't assume. Your chip sounds cherry ;-)

[For Science!]

Just now, reptileexperts said:

Don't assume. Your chip sounds cherry ;-)

Its good up till 5 Ghz  (also, its delidded), to get 5.1 GHz I have to go to not so worth voltages for stablity....

On my ASUS board (Z370-I) I was in a situation that no matter how low I put the additional turbo mode voltage, the Vcore would go to 1.28 and sometimes more when I fired up realbench.

 

In hindsight, could be related to AVX instructions that ver 2.56 of realbench uses....

 

Makes me think I need to reassess my stability using non-AVX stuff >__>

[PresidentMike]

Oh by the way, when I benchmark with Intel XTU my NZXT Kraken x52 makes this weird buzzing noise for 3 seconds, then it stops for a second and then it repeats the process?

 

This is the voltage I have to lower right?

[reptileexperts]

3 minutes ago, For Science! said:

Its good up till 5 Ghz  (also, its delidded), to get 5.1 GHz I have to go to not so worth voltages for stablity....

On my ASUS board (Z370-I) I was in a situation that no matter how low I put the additional turbo mode voltage, the Vcore would go to 1.28 and sometimes more when I fired up realbench.

 

In hindsight, could be related to AVX instructions that ver 2.56 of realbench uses....

 

Makes me think I need to reassess my stability using non-AVX stuff >__>

Yeah, I'm at 1.29 for 4.9 stable as a rock. 1.35 gets me 5.01 for benching, but I haven't stable checked encoding.

[For Science!]

5 minutes ago, PresidentMike said:

Oh by the way, when I benchmark with Intel XTU my NZXT Kraken x52 makes this weird buzzing noise for 3 seconds, then it stops for a second and then it repeats the process?

 

This is the voltage I have to lower right?

 

If I understand this correctly (which definitely may not be the case, noob overclocker here) I think you can either increase the negative offset, or decrease the core voltage itself (which for you is set to Auto at the moment). What I was eluding to above is that in my system at some point lowering the core voltage didn't actually lower the Vcore under load, and was only affected by a strong(ish) negative offset.

 

I would first try to lower the core voltage.

 

Oh and the buzzing is probably coil whine from your power delivery system (if we're thinking of the same thing). Under load it makes this gentle buzzing/sizzling sound, which in my experience is normal.

[PresidentMike]

15 minutes ago, For Science! said:

If I understand this correctly (which definitely may not be the case, noob overclocker here) I think you can either increase the negative offset, or decrease the core voltage itself (which for you is set to Auto at the moment). What I was eluding to above is that in my system at some point lowering the core voltage didn't actually lower the Vcore under load, and was only affected by a strong(ish) negative offset.

 

I would first try to lower the core voltage.

 

Oh and the buzzing is probably coil whine from your power delivery system (if we're thinking of the same thing). Under load it makes this gentle buzzing/sizzling sound, which in my experience is normal.

Can't find out what the original core voltage is now. It's set to default at the moment. If I click on there I can only go up in volts.

 

When benchmarking it is powerlimit throttling tho.

[Mat1926]

1 hour ago, PresidentMike said:

Hi Guys,

 

So I finally got my i7 8700K which ran at 100 degrees celcius (because of ASUS Multicore Enhancement) 

I don't own 8700K, but I find that odd! Some Youtubers did some tests with the the enhancement enabled and they didn't report temps that high! I doubt ASUS will release something that drives peoples' CPUs to 100 degrees...