6700K oc prime95 problems?

[BrisoX]

i OC 6700K at 4,6GHz with 1,35V. at cinebench utilization is 100% and core clocks are 4,57GHz, but with prime95 core clocks are only 4,2GHz and worker 3 has stopped. what is happening and what should i do?

[PCGuy_5960]

Use AIDA64 instead.... And do some Real-World testing.... Prime95 is rather unrealistic

[BrisoX]

6 minutes ago, PCGuy_5960 said:

Use AIDA64 instead.... And do some Real-World testing.... Prime95 is rather unrealistic

but what if aida64 gives me that message again?

[PCGuy_5960]

1 minute ago, BrisoX said:

but what if aida64 gives me that message again?

If that happens, then your overclock is unstable and you can:

1. Set the clock to 4.5GHz instead of 4.6GHz
2. Raise the voltage a bit and see if the same happens again(Not recommended as 1.35 volts is pretty much as high as you should go with a 6700K)

[Peakfire]

5 minutes ago, PCGuy_5960 said:

(Not recommended as 1.35 volts is pretty much as high as you should go with a 6700K)

You can safely go up to 1.45v with absolutely zero problems, as long as temps are within reason. The maximum safe voltage for Skylake SKUs specified by Intel is 1.52v.

[PCGuy_5960]

1 minute ago, Peakfire said:

You can safely go up to 1.45v with absolutely zero problems, as long as temps are within reason. The maximum safe voltage for Skylake SKUs specified by Intel is 1.52v.

That's the problem though.... It is highly unlikely that even a 280mm radiator would be able to keep this thing cool when using more than 1.35V....

[Moress]

6 minutes ago, PCGuy_5960 said:

That's the problem though.... It is highly unlikely that even a 280mm radiator would be able to keep this thing cool when using more than 1.35V....

I think he should just test the temps once he ups the voltage. If they're too high then lower the voltage and frequency.

[Drak3]

26 minutes ago, PCGuy_5960 said:

Use AIDA64 instead.... And do some Real-World testing.... Prime95 is rather unrealistic

Prime95 is used because of how unrealistic and taxing it can be, it's far more thorough of a test than AIDA64.

[Peakfire]

5 minutes ago, PCGuy_5960 said:

That's the problem though.... It is highly unlikely that even a 280mm radiator would be able to keep this thing cool when using more than 1.35V....

Not really. I'm running an I5 6600K at 1.38v 4.7GHz, temperatures stay below 80c with a Thermalright TRUE Spirit 120m.

Skylake requires more voltage out of the box than other generations (yet again it's just as safe and cool). A 280mm rad would be plenty for 1.45 and probably slightly more.

[PCGuy_5960]

5 minutes ago, Peakfire said:

Not really. I'm running an I5 6600K at 1.38v 4.7GHz, temperatures stay below 80c with a Thermalright TRUE Spirit 120m.

Skylake requires more voltage out of the box than other generations (yet again it's just as safe and cool). A 280mm rad would be plenty for 1.45 and probably slightly more.

Oh, I don't have a Skylake CPU, so idk. i7s usually run slightly hotter than i5s (by~1-2C)

But the best thing to do is to see how far you can go without getting temps higher than ~75C

[BrisoX]

1 hour ago, Drak3 said:

Prime95 is used because of how unrealistic and taxing it can be, it's far more thorough of a test than AIDA64.

but what's the problem when worker 3 stopps working?

1 hour ago, Peakfire said:

You can safely go up to 1.45v with absolutely zero problems, as long as temps are within reason. The maximum safe voltage for Skylake SKUs specified by Intel is 1.52v.

well i would like to go to 4,7GHz. right now i'm at 4,5GHz with 1,325V and no workers has stopped. so more core voltage is needed for workers to stop working? or not? because at cinebench test i ran at 100% and everything was good. wgar do you say about 1,38V for 4,7GHz?

[Drak3]

3 minutes ago, BrisoX said:

but what's the problem when worker 3 stopps working?

Chances are the OC isn't quite stable. It either means increase the voltage slightly, or down step the frequency.

[BrisoX]

1 minute ago, Drak3 said:

Chances are the OC isn't quite stable. It either means increase the voltage slightly, or down step the frequency.

yea, now it's fine. i crancked up the voltage just a bit

also, why prime95 doesnt run clock at 4,5GHz? only 4,2? and cinebench and other stuff run cpu at 4,5GHz?

[Drak3]

1 minute ago, BrisoX said:

also, why prime95 doesnt run clock at 4,5GHz? only 4,2? and cinebench and other stuff run cpu at 4,5GHz?

Prime95 is really good at pushing a CPU to it's max, and can see thermals that other benches won't. If it's hot enough, the CPU will throttle back a bit.

[BrisoX]

2 minutes ago, Drak3 said:

Prime95 is really good at pushing a CPU to it's max, and can see thermals that other benches won't. If it's hot enough, the CPU will throttle back a bit.

60°C is throttling? haha

[Drak3]

1 minute ago, BrisoX said:

60°C is throttling? haha

Sometimes software won't correctly register temps.

[BrisoX]

1 minute ago, Drak3 said:

Sometimes software won't correctly register temps.

after 15min only 1 worker stopped, other 7 are working... 1,325V 4,5GHz

[Drak3]

Just now, BrisoX said:

after 15min only 1 worker stopped, other 7 are working... 1,325V 4,5GHz

Sounds like the cores aren't dissipating heat uniformly, or the OC still isn't quite stable.

[BrisoX]

38 minutes ago, Drak3 said:

Sounds like the cores aren't dissipating heat uniformly, or the OC still isn't quite stable.

is 1,38V safe for every day usage?

[Drak3]

3 minutes ago, BrisoX said:

is 1,38V safe for every day usage?

If the CPU is adequately cooled, it should be safe until you upgrade.

[BrisoX]

6 minutes ago, Drak3 said:

If the CPU is adequately cooled, it should be safe until you upgrade.

well at cinebench i passed the test without crashing.. at prime95 1 worker is stopping at 4,7ghz 1,38v  

not so lucky with silicon lottery haha

[smokefest]

1 hour ago, BrisoX said:

well at cinebench i passed the test without crashing.. at prime95 1 worker is stopping at 4,7ghz 1,38v  

not so lucky with silicon lottery haha

My 6700k is similar,

I run 4.5 ghz @ 1.335 vcore, xmp memory @ 3000 mhz rest stock...

Got a cooler master evo 212 and temps are highest 77 after 4-5 hours of BF1 playing, or 79-80 highest after 8 hours of realbench stress test !!!

That said, To achieve 4.6 or 4.7 I would need a better cooler because i feel like these temps are the max I would go for a everyday OC..

Most of the days, max temps are 74-75c...so all good..

Cheers

[BrisoX]

22 hours ago, Drak3 said:

If the CPU is adequately cooled, it should be safe until you upgrade.

71°C on 4,7GHz at 1,39V in bios, CPUz showing 1,400V

On 12/25/2016 at 4:32 PM, Moress said:

I think he should just test the temps once he ups the voltage. If they're too high then lower the voltage and frequency.

well nothing is too high here hehe

On 12/25/2016 at 4:23 PM, Peakfire said:

You can safely go up to 1.45v with absolutely zero problems, as long as temps are within reason. The maximum safe voltage for Skylake SKUs specified by Intel is 1.52v.

got a question. 1,4V for eveday usage? will this shorten the life span or not? temps at max load are 71°C with noctua nhu12s. but getting kraken x61 this week, so they should get lower. around 60-65.

[Peakfire]

27 minutes ago, BrisoX said:

got a question. 1,4V for eveday usage? will this shorten the life span or not? temps at max load are 71°C with noctua nhu12s. but getting kraken x61 this week, so they should get lower. around 60-65.

The more voltage you run through the chip, the lesser the lifespan, that is a fact. No matter what voltage. 1.4v is perfectly safe however and the CPU will last at least 10 or more years.

If you're still concerned, leave the C-States & EIST on. These will dynamically lower the voltage (and frequency sometimes) when not under load.

[Moress]

71c using Prime95 is really good, Prime95 is known for making the CPU absurdly hot, much hotter than any real program will.