I7 8700K Can't Reach 5GHz at Common Voltage

[_Hustler_One_]

Hi everyone..

 

So, after almost 1 month I run the i7 8700K at stock clock and 1.1v with MSI Z370i Gaming Pro Carbon AC, today I tried to go higher straight went beyond the Turbo clock speed, 4.8GHz with 1.25v, benchmarked it smoothly. Went up to 4.9GHz but oddly found the sweet spot at 1.31v! Benchmarked it smoothly..

I read about 8700K mostly can be overclocked to 5GHz even with 1.3v..

Curious why the voltage is that high for 4.9GHz.. Decided to went even higher to 5GHz without changed the voltage at 1.31v, then increase by 0.01 till I reached 1.37v but can't get the sweet spot between 1.31v-1.37v. Then I decided to go back down to 4.9GHz with 1.31v which I'm running it currently.

 

My RAM is 2x8Gb 2666MHz OC at 3200MHz with 1.35v, XMP is enabled.

AVX offset = 0

I set the multiplier to all core fixed.

 

What makes my 8700K can't be OCed to 5GHz?

 

When I run it on 5GHz 1.34v and benchmarked it on RealBench, when it on encoding test it freezes/crashes, the max temp when it happens was 79C.. Happened the same way with other voltage, always crashed between 1.31v-1.37v but the temps didn't even reach 80C yet..

 

Did I missed something on the OC setting?

 

I searched for references on how to OC 8700K on MSI Z370i Gaming Pro Carbon AC, and found this..

https://www.anandtech.com/show/12763/msi-z370i-gaming-pro-carbon-ac-review/9

 

This gives me even bigger question, knowing it can run 5GHz with 1.275v, but why can't my 8700K run at the same voltage???

 

Please help me how can I get great result like that review I linked above..

[lmeneses]

silicon lottery probably

[_Hustler_One_]

9 minutes ago, lmeneses said:

silicon lottery probably

I saw this "silicon lottery" term alot but too lazy to find what is that mean..

So could you please explain me what is silicon lottery actually?

[Velcade]

Bump that voltage up!  Try 1.4

 

Some chips allow for better overclock than others.  Like winning the lottery it's random (unless you pay for a binned chip).

[TH3R34P3R]

7 minutes ago, _Hustler_One_ said:

I saw this "silicon lottery" term alot but too lazy to find what is that mean..

So could you please explain me what is silicon lottery actually?

So, it’s basically where not all cpu’s Have the same silicon. It makes it so some OC better than others do at the same voltage.

[DocSwag]

6 minutes ago, _Hustler_One_ said:

I saw this "silicon lottery" term alot but too lazy to find what is that mean..

So could you please explain me what is silicon lottery actually?

Basically there are small variations that may occur when manufacturing the silicon dies that affect how high they can clock; how much voltage they need; how much power they need, etc. 

 

It seems that anandtech just got a really good sample and yours is a little below average. You could try ramping up the fan speed on your cooler to reduce the temps a little bit; that may let you reach 5 ghz more easily. You could also try messing with the avx offset.

[_Hustler_One_]

14 minutes ago, Velcade said:

Bump that voltage up!  Try 1.4

 

Some chips allow for better overclock than others.  Like winning the lottery it's random (unless you pay for a binned chip).

Wut?! Might give me sauna with that high volts.. Air cooling only..

 

10 minutes ago, TH3R34P3R said:

So, it’s basically where not all cpu’s Have the same silicon. It makes it so some OC better than others do at the same voltage.

Does it turn better by deliding? I guess no.. CMIIW

[jones177]

My i7 8700k will only do 4.7ghz on all cores with 1.344v.  

 

That is why I bought a i7 8086k. It does 5mhz on all cores at 1.344v 

 

Temps are the same on both at 33c idle & 74c average on game load with a Noctua NH-D15.

 

Silicon lottery = All chips are not created equal. Some are better than others. To avoid this I bought the i7 8086k because it is a binned i7 8700k. Meaning it is guaranteed  to clock high and stay cool.

 

 

[Bananasplit_00]

probably just didnt get a great chip, putting the input voltage to 2V and using some LLC could help you push it further without needing to go too high voltage wise

[Velcade]

1 minute ago, _Hustler_One_ said:

Does it turn better by deliding? I guess no.. CMIIW

Yes!  Deliding will help drop temps and reduce thermal throttling.

 

Water will also help.  I delidded my 8700k and under normal load it sits around 42'C and under Prime95 it's around 73'C for 3hrs

[TH3R34P3R]

1 minute ago, _Hustler_One_ said:

Wut?! Might give me sauna with that high volts.. Air cooling only..

 

Does it turn better by deliding? I guess no.. CMIIW

Temps will get better with delidding, yes. But it’s not always worth it. Temps may drop by 20C if you do it right with liquid metal. 

[_Hustler_One_]

10 minutes ago, DocSwag said:

It seems that anandtech just got a really good sample and yours is a little below average. You could try ramping up the fan speed on your cooler to reduce the temps a little bit; that may let you reach 5 ghz more easily. You could also try messing with the avx offset.

Well that's suck knowing that I got a bad one. I saw there's no problem at all on the temps, I thought there's some settings that I missed which hold me down.

 

How AVX works on OC?

[_Hustler_One_]

14 minutes ago, jones177 said:

My i7 8700k will only do 4.7ghz on all cores with 1.344v.

Boooooy! That's way worse than mine.. I feel you here now..

 

14 minutes ago, Velcade said:

Yes!  Deliding will help drop temps and reduce thermal throttling.

 

Water will also help.  I delidded my 8700k and under normal load it sits around 42'C and under Prime95 it's around 73'C for 3hrs

 

17 minutes ago, TH3R34P3R said:

Temps will get better with delidding, yes. But it’s not always worth it. Temps may drop by 20C if you do it right with liquid metal. 

With that being said, so delid will only make a better temps to prevent thermal throttling only but not make it a better chip (silicon winner)  for the OC setting, right?

[Velcade]

Just now, _Hustler_One_ said:

With that being said, so delid will only make a better temps to prevent thermal throttling only but not make it a better chip (silicon winner)  for the OC setting, right?

Correct.  It won't change the inherent limitations of your chip but will help reduce temps that could be preventing you from getting the most out of what you have.

[wildgg]

before i delidded my 8700k and it ran at like 90C during stress test it wouldnt do 5ghz at 1.36V after delid and dropping 25C it was fully stable at the same settings, so yes way lower temps will def help you out but you mostly depend on silicon lottery 

[DocSwag]

9 minutes ago, _Hustler_One_ said:

Well that's suck knowing that I got a bad one. I saw there's no problem at all on the temps, I thought there's some settings that I missed which hold me down.

 

How AVX works on OC?

Avx workloads generally are more strenuous than normal workloads. An avx offset will decrease cpu clock speed during these workloads to stay stable which may let you clock the cpu higher in other workloads.

2 minutes ago, _Hustler_One_ said:

Boooooy! That's way worse than mine.. I feel you here now..

 

 

With that being said, so delid will only make a better temps to prevent thermal throttling only but not make it a better chip (silicon winner)  for the OC setting, right?

Reducing temperature reduces voltage leakage which means you may be able to reach 5 ghz with less voltage.

[TH3R34P3R]

Like me, I have a i7-9700k, 5.225ghz OC on all cores. That’s without voltage changes. I can probably push it to 5.4ghz with changes. Temps on a single 120mm rad is only like 75C... but to go to higher clocks, I’ll have to probably get a better cooler. I got rather lucky with the lottery I’ve been told.

[_Hustler_One_]

10 minutes ago, TH3R34P3R said:

Like me, I have a i7-9700k, 5.225ghz OC on all cores. That’s without voltage changes. I can probably push it to 5.4ghz with changes. Temps on a single 120mm rad is only like 75C... but to go to higher clocks, I’ll have to probably get a better cooler. I got rather lucky with the lottery I’ve been told.

Sweeeeet..

 

Which is better between 9700K and 8086K?

[_Hustler_One_]

@lmeneses @Velcade @TH3R34P3R @DocSwag @jones177 @Bananasplit_00 @wildthing forgot to mention that the Motherboard BIOS was updated to the lattest version which allow it to use Intel 9th Gen CPUs, does that affect the OC behaviour on the current chip?

[TH3R34P3R]

5 minutes ago, _Hustler_One_ said:

Sweeeeet..

 

Which is better between 9700K and 8086K?

Totally depends. 9700k has 2 more cores, but 4 less threads... however it comes with a soldered IHS instead of whatever intel did for the series prior to 9th gen.

[TH3R34P3R]

Just now, _Hustler_One_ said:

forgot to mention that the Motherboard BIOS was updated to the lattest version which allow it to use Intel 9th Gen CPUs, does that affect the OC behaviour on the current chip?

Nope it would not affect it. 

[jones177]

9 minutes ago, TH3R34P3R said:

Totally depends. 9700k has 2 more cores, but 4 less threads... however it comes with a soldered IHS instead of whatever intel did for the series prior to 9th gen.

 

For overclocking the i7 8086k is more fun. That is according to Gamers Nexus.

 

See 11:10

[_Hustler_One_]

Maybe I'll swap the chip, the 8700K on my crappy Z370 PC Pro will go to the Z370i Pro Carbon and see if it's the better one..

Silicon lottery sucks 

[Dr.Christopher_Coonan]

My 8700k runs 5 ghz all core at 1.33v. It's delidded with a copper IHS and Thermal Grizzly liquid metal. I use Arctic Silver 7 between the IHS and Cryorig H7. The guy I bought it from couldn't get passed 4.9 ghz @1.33. I do not know why. He was also disappointed it wouldn't do 5ghz all core at 1.2v. I've had it for a few years now and it is the best processor I own next to my 12400. And the jury is still out on the 12400. I have been too busy to test then both. 

[Ebony Falcon]

Delid helps with voltage as the cooler it runs the less voltage you need, mine needed 1.33v at llc 6 after delid

 

delid also takes about 25c off the temps 

If ur in uk I can post you the delid tool as long as you send it back