The 5 GHz coffee lake club

[Bhav]

Sign in and join this club with your 5 giggawiggles coffee lake chip:

 

 

[ARikozuM]

Blue Mug is best cup. 

 

Also, congratulations! I may step up to the CFL platform this summer if I feel that RAM isn't too expensive. 

[Guest]

[Bhav]

Oh wow.

 

(My chip is pathetic and won't boot at 5.1 with 1.4v).

[Jumper118]

Lol this is like a 3ghz ryzen club.... 

[Bhav]

Wait a minute ...

 

 

Wheeeee!

 

What happened was after setting 5.2 Ghz, boot up fails, and then the next boot takes ages, which was making it look like 5.1 wasnt working.

 

But 5.1 did work! (at 1.38v, and its also a cold winter night which helps, but I did that about 10 times at different settings before it was stable).

 

I cant get 5.2 to boot unless I try going over 1.4v which Im not doing.

 

_______________

 

Well 5.1 Ghz wasnt bench stable all the way up to 1.4v.

 

5 Ghz is stable at 1.36v....

 

Meh. Throw my chip in the bin, lousy only 5 Ghz

[Bhav]

1 hour ago, Jumper118 said:

Lol this is like a 3ghz ryzen club.... 

Funny as it may seem, a lot of 8700ks dont get past 4.9 Ghz, and as per my above post mine isnt stable any higher than 5.

[Ground]

1 hour ago, Jumper118 said:

Lol this is like a 3ghz ryzen club.... 

We should start a 5.5 GHz club then...

https://valid.x86.fr/ek1wqm

[Bhav]

8 minutes ago, Ground said:

We should start a 5.5 GHz club then...

https://valid.x86.fr/ek1wqm

Let's say its gotta at least pass some stability test.

[thorhammerz]

<nevermind>

Edited January 17, 2018 by thorhammerz

[xg32]

before this goes too deep, just gonna leave this here

 

"As of 12/01/17, the top 99% of tested 8700Ks were able to hit 4.9GHz or greater." -SL

 

 

[thenotoriousmma]

@5,0Ghz 

 

 

[thenotoriousmma]

@5,2Ghz

[Bhav]

10 hours ago, xg32 said:

before this goes too deep, just gonna leave this here

 

"As of 12/01/17, the top 99% of tested 8700Ks were able to hit 4.9GHz or greater." -SL

 

 

That 4.9 probably makes up more than half of that percentage fyi.

 

OCUK sell pre binned 8700ks starting at 4.9 Ghz, that means that all of these are chips that couldnt pass at 5 Ghz:

 

https://www.overclockers.co.uk/intel-core-i7-8700k-4.9ghz-coffee-lake-socket-lga1151-pre-binned-processor-oem-cp-64b-in.html

 

Likewise all of these must be chips that couldnt even pass at 4.9 Ghz:

 

https://www.overclockers.co.uk/intel-core-i7-8700k-3.7ghz-coffee-lake-socket-lga1151-processor-oem-cp-64c-in.html

[done12many2]

10 hours ago, xg32 said:

before this goes too deep, just gonna leave this here

 

"As of 12/01/17, the top 99% of tested 8700Ks were able to hit 4.9GHz or greater." -SL

 

Just to clarify.  Silicon Lottery's binning / stability verification process is kind of relaxed.  He used to only run RealBench for 1 hour to determine if a chip was stable at the clock he was listing it at.  While that's fine, it's very far from what some people would consider ensuring stability at a given clock speed.  

 

Consequently, the 1hr RealBench test became a popular standard for a lot of folks over on overclock.net for the purposes of private sales.  Anyone that knows anything knows that 1hr of RealBench is somewhat stable for most loads, but definitely not stable enough for all things.  

 

To further compound things, Silicon Lottery has now completely removed their stability testing methods from their website in favor of a new method that is undisclosed.  

 

All of this is fine considering that they have a 14-day return policy, but that 14 days starts the day you purchase it.  Not when you actually receive it via shipping.  

 

[Roen]

5 minutes ago, done12many2 said:

 

Just to clarify.  Silicon Lottery's binning / stability verification process is kind of relaxed.  He used to only run RealBench for 1 hour to determine if a chip was stable at the clock he was listing it at.  While that's fine, it's very far from what some people would consider ensuring stability at a given clock speed.  

 

Consequently, the 1hr RealBench test became a popular standard for a lot of folks over on overclock.net for the purposes of private sales.  Anyone that knows anything knows that 1hr of RealBench is somewhat stable for most loads, but definitely not stable enough for all things.  

 

To further compound things, Silicon Lottery has now completely removed their stability testing methods from their website in favor of a new method that is undisclosed.  

 

All of this is fine considering that they have a 14-day return policy, but that 14 days starts the day you purchase it.  Not when you actually receive it via shipping.  

 

Any recommendations of which suite of tests and times are necessary to ensure a stable overclock?

[Bhav]

6 minutes ago, done12many2 said:

 

Just to clarify.  Silicon Lottery's binning / stability verification process is kind of relaxed.  He used to only run RealBench for 1 hour to determine if a chip was stable at the clock he was listing it at.  While that's fine, it's very far from what some people would consider ensuring stability at a given clock speed.  

 

Consequently, the 1hr RealBench test became a popular standard for a lot of folks over on overclock.net for the purposes of private sales.  Anyone that knows anything knows that 1hr of RealBench is somewhat stable for most loads, but definitely not stable enough for all things.  

 

To further compound things, Silicon Lottery has now completely removed their stability testing methods from their website in favor of a new method that is undisclosed.  

 

All of this is fine considering that they have a 14-day return policy, but that 14 days starts the day you purchase it.  Not when you actually receive it via shipping.  

 

If you buy pre binned from OCUK, they have a 1 year warranty, but they charge a lot.

[Roen]

Just now, Bhav said:

If you buy pre binned from OCUK, they have a 1 year warranty, but they charge a lot.

Same with Silicon Lottery as well, plus if you use their binning service. I got lucky and got back a 5.3 GHz.

[Bhav]

Just now, Roen said:

Any recommendations of which suite of tests and times are necessary to ensure a stable overclock?

As with mine, while IBT Standard test was stable, even Time Spy black screened.

 

I passed a run of time spy at 1.36v, but a few hours later I still black screened, so now I have it set to 1.375v which seems like it would be more than enough.

 

The main problem with getting these OCs stable is the LLC. Even with the maximum offset my motherboard allows of 7, 1.375v in the bios still only means a maximum of 1.36v in CPU-Z, with the usual figure being 1.34v. At 1.36v similarly the CPU-Z values were 1.328 - 1.34v.

 

LLC is bad for OCing, also you need to set power delivery to the maximum so overcurrent protection doesnt switch your PC off, and offset the AVX frequency (My AVX frequency works at 4.8 Ghz 1.35v+, but 4.9 Ghz is instant errors in IBT all the way up to 1.4v).

 

Overclocking these chips for 24/7 stability isnt easy.

[Bhav]

For fun:

 

A crappy 8700k @ 5 Ghz:

 

 

Utterly destroyed by a vastly superior G4400 @ 3.3 Ghz:

 

 

 

(Erm, lower means better right?).

[Roen]

6 minutes ago, Bhav said:

As with mine, while IBT Standard test was stable, even Time Spy black screened.

 

I passed a run of time spy at 1.36v, but a few hours later I still black screened, so now I have it set to 1.375v which seems like it would be more than enough.

 

The main problem with getting these OCs stable is the LLC. Even with the maximum offset my motherboard allows of 7, 1.375v in the bios still only means a maximum of 1.36v in CPU-Z, with the usual figure being 1.34v. At 1.36v similarly the CPU-Z values were 1.328 - 1.34v.

 

LLC is bad for OCing, also you need to set power delivery to the maximum so overcurrent protection doesnt switch your PC off, and offset the AVX frequency (My AVX frequency works at 4.8 Ghz 1.35v+, but 4.9 Ghz is instant errors in IBT all the way up to 1.4v).

 

Overclocking these chips for 24/7 stability isnt easy.

Damn, thanks for the info.

[done12many2]

10 minutes ago, Bhav said:

If you buy pre binned from OCUK, they have a 1 year warranty, but they charge a lot.

 

I might just be a more validated bin as well.  I believe OCUK runs their chips through Prime95 testing before selling them.  This is why their chips would appear to clock lower than those from Silicon Lottery.  They all bin chips.  One retailer doesn't magically get a lot more higher binned chips than another.  They just verify their stability at those claimed speeds differently.  

[porina]

i3 peasant race. 5.0 is bench stable. I can't get it 5.1 bench stable at any voltage but did get a 5.2 submission into hwbot.

 

 

[Bhav]

1 minute ago, done12many2 said:

 

I might just be a more validated bin as well.  I believe OCUK runs their chips through Prime95 testing before selling them.  This is why their chips would appear to clock lower than those from Silicon Lottery.  They all bin chips.  One retailer doesn't magically get a lot more higher binned chips than another.  They just verify their stability at those claimed speeds differently.  

Right. As a warning, dont buy the OEM 8700k from such places that Pre Bin ... those will all be chips that couldnt even pass the minimum binning of 4.9 Ghz.

[done12many2]

14 minutes ago, Roen said:

Any recommendations of which suite of tests and times are necessary to ensure a stable overclock?

13 minutes ago, Roen said:

Same with Silicon Lottery as well, plus if you use their binning service. I got lucky and got back a 5.3 GHz.

 

Truthfully, a CPU only needs to be as stable as you need it to be for your particular workload.  With that said, if you do a lot of gaming/video editing, RealBench for a 2 to 4 hours is a great test.  

 

I can tell you first hand that just because it's RealBench stable, doesn't mean that it will be stable enough for all workloads.  

 

Best thing you can do if you want to ensure stability in all situations is to throw all situations at the chip.  Remain flexible and adjust as you go.  Minimum VCore needs to be as high as the toughest load requires.  Not as low as you can get away with as a lot of people try to do.  

 

Good luck and have a blast with it man.