Why is my 4790k running at 4.4 ghz full load during stress test?

[709zzy]

Shouldn't it be 4.0 ghz all core, so why is mine always at 4.4ghz when I test it?
My bios settings are all at auto. Motherboard Z97x UD3H.

I read somewhere that this might be something called enhanced turbo? Does anyone know how I could disable this without disabling the normal turbo?

 

[faalin]

4.4ghz is the boost speed of the cpu, everything is running how it should be.

 

[709zzy]

4.4ghz is the boost speed of the cpu, everything is running how it should be.

4.4ghz all core is normal? Shouldn't it only reach 4.4 if one core is used?
I thought all core under load would disable turbo speed?

 

[filippi]

Many motherboard brands implement Turbo Mode differently than Intel boards. And GIGABYTE Z97X-UD series has Automatic Overclock option.

See this article: http://www.extremetech.com/computing/185512-overclocking-intels-core-i7-4970k-can-devils-canyon-fix-haswells-low-clock-speeds/2

"One thing to be aware of is that Haswell’s Turbo mode operates somewhat differently than other Intel chips. In the past, Intel quad-cores would often hit full Turbo frequency on all four cores, even under full load. Haswell changed this — the Turbo Mode frequency for all four cores is now typically 200MHz below the maximum speed. The Core i7-4770K therefore runs Prime95 at 3.7GHz on all four cores, while the Core i7-4790K runs at 4.2GHz. In our tests, we locked all four cores at the same frequency — at 4.4GHz, our Core i7-4790K is technically overclocked by 4.7% (at least, compared to how Intel normally implements Turbo Mode)."

Ref. about GIGABYTE Z97X-UD Overclocking: http://www.anandtech.com/show/7964/gigabyte-z97x-ud5h-review/4

 

[709zzy]

Many motherboard brands implement Turbo Mode differently than Intel boards. And GIGABYTE Z97X-UD series has Automatic Overclock option.

See this article: http://www.extremetech.com/computing/185512-overclocking-intels-core-i7-4970k-can-devils-canyon-fix-haswells-low-clock-speeds/2

"One thing to be aware of is that Haswell’s Turbo mode operates somewhat differently than other Intel chips. In the past, Intel quad-cores would often hit full Turbo frequency on all four cores, even under full load. Haswell changed this — the Turbo Mode frequency for all four cores is now typically 200MHz below the maximum speed. The Core i7-4770K therefore runs Prime95 at 3.7GHz on all four cores, while the Core i7-4790K runs at 4.2GHz. In our tests, we locked all four cores at the same frequency — at 4.4GHz, our Core i7-4790K is technically overclocked by 4.7% (at least, compared to how Intel normally implements Turbo Mode)."

Ref. about GIGABYTE Z97X-UD Overclocking: http://www.anandtech.com/show/7964/gigabyte-z97x-ud5h-review/4

How do I disable this automatic overclock then? If I lock the multiplier to 40 in the BIOS then turbo just won't happen at all, no matter if single core is used or if all cores are used.

 

[709zzy]

Ok, I think I got it, there is a turbo option in the bios for each stage (1,2,3, or 4 cores used). They were all at auto thats why I had 4.4 ghz even all 4 cores were under load. I just changed them manually to 4.4, 4.4, 4.3, and 4.2 respectively and now I only get 4.2 ghz with all 4 cores under stress load. I guess my BIOS thought auto means the maximum value.

 

[filippi]

Nice! Good luck mate!

PS. I was downloading Z97x UD3H manual

 

[DubbleClick]

Happened same to me sometimes, using gigabytes z97x-sli. Don't worry about that, though. Standard would be 4.2ghz so thats just a 200mhz increment and only during all core stress tests. For usual usage it won't even change anything.

 

[T3rm1]

Hey 709zzy
I have the same combination and I wonder if you ever encountered random restarts with the default bios settings (even without full load, just idling in Windows). That's my problem right now.
Temperature is not an issue and the power supply is strong enough. It seems to work fine if I disable the turbo in bios (not sure yet, ran fine for 3 hours). However that can't be a solution. I want to use it.