Question 8700K at 4.90 at 1.30 good or bad?

[anshugiri]

Hello folks,

I just moved up from an 8600k to a 8700k. My OC is stable at 4.9ghz (no avx offset) at 1.30v, with uncore at 4600mhz. Is this a good or bad chip? I tried 5.0 (avx -1 offset) at 1.38... it was stable for prime95 1344k stress test for an hr... but real bench crashed because temps went over 100c.

I am using a Noctua NH-U14s cooler, and 3200 CL16 ram OC'd to 3466. Asus Z370-A Prime.
VRM Temps were in 70's even at 1.38v.

Thanks in advance.

 

[Rodrigodrt]

pretty good imo, 1.30v is perfectly safe, seems like more worth it than chasing 5.0 because the improvements seem quite diminishing, but perhaps, if you can get away with 1.30v @ 4.9, maybe you can even with 1.35v dish that 5.0 if you give some more input voltage and lowering or actually increasing the ring ratio, + a bit of ring voltage cause this too helps stability.

also system agent voltage helps stabilize a memory controller that otherwiselly causes crashes making you think vcore is to blame, when moreoften .5v on vcore is enough for 100mhz bump.

 

[faalin]

What are you system specs?

Have you played with the LLC at all?

I know not all CPU's are equal but I run 5.1Ghz @ 1.37v, 6 out of 7 or line load calibration, CPU cache ratio 46, and no AVX offset

I know it sounds scary but have you thought about deliding your CPU?

 

[anshugiri]

What are you system specs?

Have you played with the LLC at all?

I know not all CPU's are equal but I run 5.1Ghz @ 1.37v, 6 out of 7 or line load calibration, CPU cache ratio 46, and no AVX offset

I know it sounds scary but have you thought about deliding your CPU?

Asus Z370-A prime
Gskill trident z rgb 3200 cl16 2 x 8gb
Nhu14s

yes, I’ve set to llc 6, controls droop best in my case.

haven’t considered delidding.

 

[zx128k]

Seems that you at least have a chance of getting a higher frequency.

8700K	4.80GHz	4.60GHz	1.375V	100%
8700K	4.90GHz	4.70GHz	1.387V	Top 99%
8700K	5.00GHz	4.80GHz	1.400V	Top 83%
8700K	5.10GHz	4.90GHz	1.412V	Top 49%
8700K	5.20GHz	5.00GHz	1.425V	Top 17%
8700K	5.30GHz	5.10GHz	1.437V	Top 4%

You could try for 5GHz at 1.37 volts. They did with your cooler here https://www.overclockers.com/noctua-nh-u14s-heatsink-review-2/

 

[faalin]

Its not your exact board but it is an Asus board so the bios might be really close

View: https://www.youtube.com/watch?v=CoUtA7DKXhU


I used this as a guide to overclock my 8700k. I also used the Rockit 88 delid kit with there solid copper IHS. 1 core tops out at 78*c with the rest in the mid 70's, thats at 5.1Ghz with no AVX offset.

 

[anshugiri]

Anyways, the local shop allowed me to return it and take another chip... its stable at 1.3v 5ghz with no avx offset... and even chip to chip at same voltages and load... the new chip is 5-8c cooler running.