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stock 6700k- clocks 4-4.2 ghz during load.

post #1 of 12
Thread Starter 
Hello. Like we know 3dmark was updated to Fire strike stress test mode. I bench using Fire Strike stress test ULTRA on my 980 Ti Gaming Xtreme and 6700k on stock. Result are normal.

My screen, take a look on cpu frequency ( 4 to 4,2 ghz ):

https://postimg.org/image/pqpkrehhz/
'

But cpu frequency during test is drifting between 4-4,2 ghz i dont know why. Is this normal?



Any ideas why i have different clock rating during test? ( 4.0 - 4.2 or 4.2 to 4.0 ).

Also cpuz reporting stable 4ghz , real temp reporting 4.2 mhz. Weird.
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post #2 of 12
That looks like how I would expect it to function. By default, it's set to run at 4.0GHz during full load, but if the load drops on a few cores (not sure how many in this case), the others will increase to 4.2GHz. That's just the way Intel Turbo Boost is set up.

Edit:
For reference, the i5-6600K (my chip) was set up like this by default:
3.5GHz normal
3.6GHz turbo on all 4 cores (I assume 3.5 vs 3.6 was based on temperature)
3.7GHz turbo on 3 cores
3.8GHz turbo on 2 cores
3.9GHz turbo on 1 core
Obviously the i7-67000K is doing something simpler than that since base & turbo frequencies are so much closer together, but that's the idea.
Edited by dlewbell - 6/18/16 at 7:14am
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post #3 of 12
Thread Starter 
Ok thx for explanation . But why cpuz reporting 4 ghz always? And real temp reporting always 4.2 ghz ?
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post #4 of 12
I don't know enough about either program to say. I only started using CPU Z after I overclocked my chip, so I don't know how it acts when you still have turbo boost enabled. I've never used real temp, so I don't know anything about it. For what it's worth, I've been pretty happy using HWiNFO 64 for monitoring my temps & voltages.
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post #5 of 12
With stock settings, the turbo boost frequency that's used changes depending on how many cores are running/sleeping. You get the full speed only when just one or maybe two cores are running while the rest of the cores are sleeping. If all four cores are running at the same time, you get a reduced speed. The reason for this setup seems to be to keep temperatures in check. There's a turbo boost frequency table that's shows the numbers somewhere on Intel's website.

You should be able to set a fixed 4.2 GHz turbo for all four cores in the BIOS if you want to. This should work stable without having to tweak voltage.
post #6 of 12
Thread Starter 
So if futuremark monitor showing drifting between 4.0 4.2 ghz is normal ?
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post #7 of 12
Quote:
Originally Posted by sew333 View Post

So if futuremark monitor showing drifting between 4.0 4.2 ghz is normal ?

Yes it is normal. I don't think it is anything to worry about. If you want constant turbo clock speed then you can set your windows power plan to 'High Performance' instead of the 'Balanced' profile which is fine and is set by default.

You can access this setting via Control Panel > Power Options.
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post #8 of 12
Thread Starter 
I understand . But why somebody with 6700k get stable 4.2 ghz ( without dropping to 4ghz ) in that test. Look:


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post #9 of 12
At default bios settings, when the 6700K has 4 cores active, the multiplier drops down to 40 so the CPU will run at 4.0 GHz. That is the Intel specification for the 6700K.

Some motherboards have a simple bios option that you can turn on so when all 4 cores are active, the multiplier will be 42 instead of 40. If you want your CPU to run at a steady 42 multiplier then you need to turn that option on in the bios or you need to manually set the turbo multipliers to

1 core active - 42
2 cores active - 42
3 cores active - 42
4 cores active - 42

The turbo power limits also need to be set high enough in the bios to enable full turbo boost so the multiplier can run at a steady value of 42.

The version of RealTemp you are using was released years ago, long before the 6700K existed. It does not correctly report the MHz of your 6700K so ignore it.
post #10 of 12
Normal, 6700k is 40-42x multiplier and it varies, same way you can setup your OC per core count the turbo by default is setup per core count. You can find the precise clocks for each core load in 6700k specs.
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