Intel and AVX offset

[BeastyBaiter]

So with this shiny new i7-8700k, I've run into a bit of a problem. 4.7 GHz all cores all the time is trivial to achieve, much like 4.0 GHz for the R5 1600X. I have also managed to get the 8700k up to 5.0 GHz without going too nuts on the vcore but I can only do that with -3 AVX offset. This in turn means that both BoX and DCS run at 4.7 GHz since they use AVX instructions. So I'm wondering as to if other users with this architecture (skylake, kabylake, coffeelake) are doing any better. I know I've seen a lot of references here to using the AVX offset, so I'm wondering if the limit I'm seeing at 4.7 GHz is the norm.

Edited November 18, 2017 by BeastyBaiter

[I./JG68_Sperber]

I have the 7700K with AVX=0

Overclock to 4.9 and every time exactly 4.9 in BOX....

Temperatur = 61°C

[BeastyBaiter]

What voltage are you running, and by that I mean the actual voltage under load (e.g. CPUID HWMonitor CPU VCore during a stress test).

Edited November 18, 2017 by BeastyBaiter

[I./JG68_Sperber]

I think 1,3V

Fly over 60h with VR on TAW without problems...

[Fran13]

Hi BeastyBaiter: Just a question I was thinking upgrade my PC, an 4 years old i5, do you think the best will be get a I7 or an AMD ? Thanks!

[TG-55Panthercules]

What voltage are you running, and by that I mean the actual voltage under load (e.g. CPUID HWMonitor CPU VCore during a stress test).

 

With my 7700K OC'd to 5.0 (and AVX offset = 0), VCore is reported by CPUID as just under 1.4 (usually around 1.39 something).  Appears to be stable during stress testing (RoG Realbench) and in BoX with VR so far, and BoX VR benchmark results indicate that it really is running at 5.0 during BoX.

[BeastyBaiter]

Right, was able to get it sorted at 1.36v with the maximum LLC setting (HWMonitor shows min of 1.344v and max of 1.36v). Not entirely sure that's a safe voltage though, especially with that LLC setting.

 

As for Ryzen vs Intel, I'll do a dedicated thread on that as it's worth looking at. The short version is it depends.

[SCG_Fenris_Wolf]

What the guys forgot to mention was that they have delidded their CPUs (I do not know about Sperber, but I suspect it).

 

Without that, it is indeed very hard to push beyond 4.7GHz, unless you have gotten a good bingo in the silicone-lottery!

 

 

Delidding is part of a good overclock for these kind of chips. Try Rockit88 or Dr.Delid or DelidDieMate in Google, but make sure to look for their successor-versions as the ones I mentioned are for KabyLakes!

[TG-55Panthercules]

What the guys forgot to mention was that they have delidded their CPUs (I do not know about Sperber, but I suspect it).

 

Without that, it is indeed very hard to push beyond 4.7GHz, unless you have gotten a good bingo in the silicone-lottery!

 

 

Yeah - before the delidding I had stopped at an OC of 4.8 because the temps at 5.0 were too high for my taste, but after I gained about 15-20 degrees C through delidding my 7700K I was able to crank it back up to 5.0 and still stay within decent limits.

[BeastyBaiter]

Temps don't seem to be an issue, just spent the last 2 hours playing DCS on 104th, CPU package and cores hovered around 40-50 C. Admittedly DCS only stresses 1 core, but the same is true of BoS. Pic of HWMonitor, everything looks good to me on it. HWMonitor was opened right from boot, so it shows everything, including about 20-30 minutes of not-DCS.

 

Edited November 19, 2017 by BeastyBaiter