core temperature Question regarding 8700k

[Error0xFF]

Hi everyone,

 

This is my first post here. i have a small issues i'd like to clear from my head.

i recently upgraded my pc from an AMD FX8350 cpu to Intel 8700k

 

System specs:

  CPU Type                                          HexaCore Intel Core i7-8700K, 4700 MHz (47 x 100) 
  Cooler                                                Noctua NH-D14
  Motherboard Name                           Asus Prime Z370-A II  (4 PCI-E x1, 3 PCI-E x16, 2 M.2, 4 DDR4 DIMM, Audio, Video, Gigabit LAN)
  Motherboard Chipset                         Intel Kaby Point Z370, Intel Coffee Lake-S
  System Memory                                16316 MB  (DDR4 SDRAM)

  BIOS Type                                         AMI (03/12/2019) Latest

 

i have 5 PWM fans in case 2 front for intake, 2 top for exhaust and 1 back for exhaust

i'm running at variable frequency, everything stock just adaptive voltage 1.2V offset 0.030V, AVX offset -2, MCE Enabled

everything worked fine, good temps, until a few days ago when i had to take everything out (cooler also) so i had to re-apply paste. 

after applying paste and did a prime95 test to check the temps, i noticed that core 1 temp has increased and core 5 temp is decreased. like a  10-11 degrees difference between these 2 cores

 

these are the IDLE temps

 

these are the LOAD temps

 

 

EDIT: just noticed that in the stress/load temps image core 5 wanst fully loaded so i attached another with all cores to 100%

 

now the big question: should i delid because of this temp difference or is nothing to worry about?

 

cheers,

Liviu

[TrigrH]

7 minutes ago, Error0xFF said:

now the big question: should i delid because of this temp difference or is nothing to worry about?

You only need to delid if you want to overclock harder. I've done it, i'm using closer to 1.38v 5.2ghz no avx offset.

[Falco5150]

4 minutes ago, Error0xFF said:

i noticed that core 1 temp has increased and core 5 temp is decreased. like a  10-11 degrees difference between these 2 cores

was there that big of a temp difference between the cores under load before you repasted?

It's very possible that your new paste application is bad, or your cooler has uneven mounting pressure. I would try repasting and remounting the cooler again if you're concerned about it.

a 10C difference between cores under load is not unheard of.

Your temps under load are not high enough to be too concerned about. I wouldn't recommend delidding unless you were trying to push a high overclock. Your temps are not high enough to warrant the risk.

[Error0xFF]

1 minute ago, Falco5150 said:

was there that big of a temp difference between the cores under load before you repasted?

It's very possible that your new paste application is bad, or your cooler has uneven mounting pressure. I would try repasting and remounting the cooler again if you're concerned about it.

a 10C difference between cores under load is not unheard of.

Your temps under load are not high enough to be too concerned about. I wouldn't recommend delidding unless you were trying to push a high overclock. Your temps are not high enough to warrant the risk.

thanks for the reply Falco

 

i didnt have that temp difference before. also i reapplied paste 3 times already, Arctic MX-4, also took off the cooler and remounted it 2 times, everytime the exact same result. im asking about delid because im thinking that somehow, something happened inside with the paste between IHS and DIE, is that possible?

also im not planning to push the CPU more than 4.7 or 4.8 GHz

[Falco5150]

13 minutes ago, Error0xFF said:

thanks for the reply Falco

 

i didnt have that temp difference before. also i reapplied paste 3 times already, Arctic MX-4, also took off the cooler and remounted it 2 times, everytime the exact same result. im asking about delid because im thinking that somehow, something happened inside with the paste between IHS and DIE, is that possible?

also im not planning to push the CPU more than 4.7 or 4.8 GHz

hmm. I guess technically it would be possible for something to happen with the paste between the IHS and DIE, but it's not that likely. Since you don't plan to push your overclock I honestly wouldn't worry about it. A 10c difference between cores under a full load is within the normal range. And your temps are staying in the mid 70's in prime 95 isn't bad and is well within the safe limit so a delid isn't worth the risk or hassle. You probably won't get anywhere close to that temp during normal use so I think you're totally in the clear here.

[Error0xFF]

thanks Falco!

if that difference is safe, then i'd like to keep my CPU warranty

[Falco5150]

15 minutes ago, Error0xFF said:

thanks Falco!

if that difference is safe, then i'd like to keep my CPU warranty

No problem. 

[jones177]

I7 8700ks are not created equal.

 

Some run hot, Some run cool and some are unstable with any overclock. What you end up with depends on luck.

 

Here are the results of when I first got my i7 8086k. You will notice one core is hotter stock and manually overclocked.

 

 

This is a gaming test(ACO) of my other i7 8086k at 5.1ghz. You could say it has 2 hot cores.

 

  

 

I think stability comes first then deal with heat.  As you can see my noctua d15 is doing just fine.

[Error0xFF]

Quote

I think stability comes first then deal with heat.  As you can see my noctua d15 is doing just fine.

yep, you are right. ill just stay away from delid for now, i'm running at 4.7GHz, got 1532 cb in Cinebench R15 so im taking that as a good result and enough for what i'm doing with my PC. 

 

thanks for the answers everyone, i guess thread can be closed