8700K on auto voltage

[alehei]

Hi all,

I recently bought an 8700k and it's range is from 3.7 on all cores to 4.7 turbo on 1 core. I want to overclock my chip to 4.7 ghz on all cores.

My plan is to disable turbo and mce, select sync all cores and raise my multiplier to 47.

Now, I came from a 6700k and i took the same root and oc'd it to its max turbo frequency (4.2 on all cores) and I was able to acheive this by leaving auto vcore.

Now my question is, since the 8700k has 6 cores,will auto vcore still be sufficient to clock up all cores? and if not, what voltage and lcc would you recommend?

Before telling me that i should try for 5 ghz I want to say thhat the reason I use auto vcore is because I'm not that convident in manual voltages and I generally just oc my cpu's to their max turbo since it will be enough for me. Also, I am using a corsair spec 01 as a case, and it has 150 mm limit cooler height and 240 mm water AIO is a bit of a pain to fit in so I dont want to give unnecessary voltage on my CPU that will abuse my H7 Quad lumi (yep i know its not the best cooler but thats one of the best coolers I can only fit in my case and I really love the SPEC 01 and I dont wish to change it if possible).

Thank you for reading my query

 

[Snipergod87]

I found Auto Vcore (when using MCE) was way overshooting (8700k), I set my voltage for 6 cores at 4.7Ghz to 1.22 V with LLC set to 5, auto was doing 1.35v with LLC set to 1 so it had some pretty bad droop

 

[alehei]

I found Auto Vcore (when using MCE) was way overshooting (8700k), I set my voltage for 6 cores at 4.7Ghz to 1.22 V with LLC set to 5, auto was doing 1.35v with LLC set to 1 so it had some pretty bad droop

Hi Snipergod87,
Thank you for answering.

I know each chip is different but what voltage should I approximately start at? and besides LCC do I need to set anything else?

Also I wish to add, how much do you think is the absolute max voltage I should give the cpu to obtain a stable 47 multiplier that will be safe to use with a 160 tdp cooler and good case airflow? (I don't really bother if it reaches like 90c on Prime95 since in games it will be a lot less)

 

[Snipergod87]

I personally wouldn't go to much above 1.38 for longevity myself, but might want to see what other people have done, you are right that each chip is different though, LLC levels manage the vdroop under heavy loads, setting it to 5 allowed 1.22v when the CPU is maxed on all cores, if it was set to level 1 it would drop to like 1.15 and crash.

What I would do so pick something like 1.25v and LLC maxed out (might be 5 on your board), monitor the voltages and temps and run some stress tests, if it crashes bump up the voltage, if it is stable you can go ahead and decrease it.

I am using mine on a low end Cryorig cooler so if all cores are maxed out under heavy loads (In Prime95) I will get temps in the 90's after half and hour but not enough to throttle, and real world it isn't hit heavily for an extended period of time.

If you want to adjust the UnCore speed do that after you get a stable OC, the less things you change at once the better for testing whats stable.

 

[alehei]

I personally wouldn't go to much above 1.38 for longevity myself, but might want to see what other people have done, you are right that each chip is different though, LLC levels manage the vdroop under heavy loads, setting it to 5 allowed 1.22v when the CPU is maxed on all cores, if it was set to level 1 it would drop to like 1.15 and crash.

What I would do so pick something like 1.25v and LLC maxed out (might be 5 on your board), monitor the voltages and temps and run some stress tests, if it crashes bump up the voltage, if it is stable you can go ahead and decrease it.

I am using mine on a low end Cryorig cooler so if all cores are maxed out under heavy loads (In Prime95) I will get temps in the 90's after half and hour but not enough to throttle, and real world it isn't hit heavily for an extended period of time.

If you want to adjust the UnCore speed do that after you get a stable OC, the less things you change at once the better for testing whats stable.

Thanks a lot for your detailed help and sorry for asking such noob questions 😛
May I ask which cooler? I'm myself running on a Cryorig too (h7 quad lumi) coming from my 6700k and was wondering how well will it fare with the 8700k slightly overclocked cause everyone just bashes them that they can barely handle them at stock and it's really nice seeing someone doing at least a mild OC on a "low end Cryorig"

 

[Snipergod87]

I have the Cryorig H7 (normal one non-RGB). If Intel didn't use crappy thermal paste between the CPU die and the IHS you could probably expect temps 15-25c lower. I purposely lowered the voltage as low as I could when stress testing to reduce heat output to lower the chance of thermal throttling.

 

[alehei]

Yep I heard about that thermal problem and I hope I wont have to delid to get my 4.7 ghz.

Lets hope they fix this issue with cannonlake 😛