Overclocking 8700K with Air Cooler Help

Sep 2, 2018
7
0
10
http://

Wanted to overclock my new PC
NOTE: I HAVE NOT DELIDDED YET AND I AM PLANNING ON DOING IT TOMORROW OR IN THE NEXT FEW DAYS
.
I started at 4.8 GHZ and was able to get it stable at 1.20 V with idle temps at 39-41 C and Load at 67-72 C.These look pretty normal to me and wasn't too far from my temps pre-OC.I then tried 4.9 at 1.23 V and my idle temps are similar at 40-41 C but the Load temps are strange, 4 of my cores were averaging around high 60's low 70's with Max in the 80's. However, 2 of my cores are in the 80's, maxing out at 90-92 C, which I'm sure is probably not that good...I am not even going to try to push to 5.0 GHZ until I delid.
My questions are:
1. I am wondering what temps people are getting on their i7-8700K, pre-Delid, when overclocked 4.8 to 5.0 GHZ
2. Why are the temperatures on the cores are so inconsistent. Is that normal to have some cores much hotter than the others while under load/running stress test? If not, is there a solution to fix this? Maybe I didn't apply my thermal paste correctly when installing my CPU cooler?
3. How come on my CPU-Z, the Core Voltage shown is different from the settings that I manually put on the UEFI?for example, the image says 1.184 when I set the voltage at 1.23?
Opinions and any information will help! Thank you!
 

Karadjgne

Titan
Ambassador
1. Hot, very hot, even with big cooler capacity 5.0GHz is outrageously hot.
2. The Tim. It's quite lackluster and not very consistent in application, it's thicker over some cores, thinner over others. Can also depend on what's being run for stress test and just how hard any core is being used.
3. Take a closer look. Cpu voltage you set is quite different than VID, but both look similar at a glance. I have used 2 different current versions of Cpu-Z, the default and MSI, default reports vcore, MSI reports VID.

Also, the cpu will only use what it needs upto the limits you set plus any offsets. You set for 1.23v, it only needs 1.18v VID for stability, VID being what the cpu is actually using.
 

Spinachy

Honorable
Feb 17, 2016
163
1
10,765
Different cores within the same CPU will overclock differently. This is why the higher clock speeds given by manufacturers when running on a reduced core count, use a "best core" algorithm, to select the best core to run reliably at that higher rate. You need to limit the max clock on a per-core basis, not just push them all to the same clock rate.