Coffee Lake Overclocking Thread, Why Not - Sharing is Caring

[Campy]

Memory OC seems pretty decent:

Nice!

 

[nathanddrews]

Impressive! My 4.2GHz Ivy is jealous.

 

[Geforce man]

and here I had just decided that my 6700k @ 4.6Ghz delidded @ 65c max temps was more than enough (on air). Silly me.

 

[LTC8K6]

Pretty easy to see if it's throttling. In HWinfo Set your polling speed to highest setting, and reset the clock just after you start cinebench run.

looking at your IBT, looks like it might have been throttling there also? Look at your your min max and avg.

Yes, IBT score is quite low.

 

[dbrons]

Wow, nice. Can't wait to get mine

 

[Chrisch]

here some benches with my 8600K @ 5.4GHz



my daily setting (with AVX load)



5.5GHz boot with ~1.38-1.4v vcore, but this isnt stable for cinebench

Intel Core i5 @ 5500 MHz - CPU-Z VALIDATOR

 

[firewolfsm]

Does anyone have a non-k processor? Can anyone confirm if the BCLK can still be set to 103Mhz on non-K processors? And if the uncore can be overclocked?

 

[Bouowmx]

You can increase cache/ring frequency of non-K processor: PC Gamer
You can set 103 MHz BCLK: TechPowerUp

 

[StinkyPinky]

My system is up and running, no time to overclock it yet though. Will try in the next day or so.

 

[PhonakV30]

Memory OC seems pretty decent:

So memory latency for DDR4 4000 is around 38ns at 5Ghz CPU

 

[Chrisch]

Prime run without AVX

 

[Arachnotronic]

I want Intel to do a 14nm+++ and then a 14nm++++ that ultimately delivers us 6GHz goodness.

 

[RichUK]

here some benches with my 8600K @ 5.4GHz



my daily setting (with AVX load)



5.5GHz boot with ~1.38-1.4v vcore, but this isnt stable for cinebench

Intel Core i5 @ 5500 MHz - CPU-Z VALIDATOR

Wow, that's pretty nuts.

Busy week at work, so I'll be delidding this weekend. Hopefully I can get stable at 5.2

 

[StinkyPinky]

What voltage do you guys think is a safer long term one? 1.35?

I hit 5 on my 8700k pretty easily so I'm thinking I may be able to get 5.1 at or below 1.35.

 

[TahoeDust]

What voltage do you guys think is a safer long term one? 1.35?

I hit 5 on my 8700k pretty easily so I'm thinking I may be able to get 5.1 at or below 1.35.

I would say as much as you can cool under 1.4v. You will probably hit the thermal wall before that. Just make sure you set a reasonable AVX offset. Don't let the heat produced by AVX limit your non AVX overclock. You probably already do something similar, but I adopted this practice when working on my 7820x...

1) Set desired clock and max acceptable voltage

2) Use Cinebench for quick stability test, lowering voltage each time it passes to find lower passable voltage

3) Use Prime95 v26.6 ~30 minutes to test thermals/stability without AVX increasing voltage after every crash until stable...if thermals are too high, lower clock and go back to step one.

4) Use Prime95 v29.1 ~30 minutes to check thermals/stability with AVX. If too hot or unstable with AVX, increase AVX offset.

Once stable and with acceptable temps move on to longer stability testing.

 

[EliteRetard]

It looks to me like all modern CPUs (AMD and Intel) now have a safe limit around 1.35v with a "risky" 24/7 limit of 1.4v (with very good cooling). Same numbers for DDR4, that makes it all easy to remember.

 

[AdamK47]

I do like the memory overclocks with the 8700K. It looks like I'll be able to run the same 4133 CAS16 settings on an 8700K / Z370 setup as I do now with my 7740X / X299. That is, if the 8700K ever becomes available.

 

[EliteRetard]

I do like the memory overclocks with the 8700K. It looks like I'll be able to run the same 4133 CAS16 settings on an 8700K / Z370 setup as I do now with my 7740X / X299. That is, if the 8700K ever becomes available.

I'm curious, how'd you get a free 7740X?
Obviously nobody would ever pay for one...

 

[Chrisch]

Some GFlops



Will get later new memory and hope for DDR4-4000 / 4133 with solid timings.

 

[Chrisch]

Now with new memory..



@ RichUK, can you maybe make some screenshots of your memory settings (subtimings)?

Btw 5.5GHz Cinebench R15 done on water

 

[Campy]

Btw 5.5GHz Cinebench R15 done on water

That's sick! Is it stable in prime, too? Custom loop or AIO?

 

[Chrisch]

No not stable, only stable enough for a CB run

5.3GHz is the max which i tested with prime (non-AVX).

Btw its a custom loop (Heatkiller IV Pro with 480 radiator).

 

[Bouowmx]

How overclockable is cache/ring/uncore frequency? I ask because I run an app that sees tangible benefits from reducing memory subsystem latency (uncore and main memory). Of course, core frequency is still king.

 

[Eric1987]

Seems like Ryzen would match or beat these scores if it could get to 5GHz+ clock speed seems like the only advantage Intel has.

 

[TahoeDust]

Seems like Ryzen would match or beat these scores if it could get to 5GHz+ clock speed seems like the only advantage Intel has.

Yep. Pretty much, but that is a big one. I hope they can keep pushing intel.