HELP CPU doesn't run at max clock

[Khai Nguyen]

I overclocked my 6700k to stable 4.6 and 4.7ghz (tested with realbench, able to run at max clock).

How ever, when I test it with aida64, intel burn in, cinebench, the cpu doesn't reach max oc clock it usually stay between 4.2-4.5.

I don't know what caused it. I cleared cmos, reinstalled windows, turn off c state and est but the problem still there. 

When every settings is at stock (cpu and motherboard), the clock never stay at 4.2 ghz when using cinebench, intel burn in, and aida64. It only stay at 4.0ghz. The 6700k should get up to 4.2ghz when under load.

PLZ helpppp

 

I am using the kraken x61 and msi z170a pc mate motherboard.

[scottyseng]

2 minutes ago, Khai Nguyen said:

-snip-

The CPU temps were okay right? Hmm, that is pretty strange for the other programs not to make go to max clock. Have you used another program like CPU-Z just to double check the CPU clock speed?

[Paula_The_Butter_Fairy]

is cooler ok?

[Khai Nguyen]

3 minutes ago, scottyseng said:

The CPU temps were okay right? Hmm, that is pretty strange for the other programs not to make go to max clock. Have you used another program like CPU-Z just to double check the CPU clock speed?

I used HW monitor and other program, they all report the same frequency as aida64. BTW, it run at max when only test the CPU alone in aida64, but not CPU, FPU, and cache together.

[Khai Nguyen]

3 minutes ago, Paula_The_Butter_Fairy said:

is cooler ok?

Temp are okay when test with realbench (which run at max speed)

for some reason, it doesn't run at max speed with other program like aida64, cinebench, intel burn in, prime95...

[Paula_The_Butter_Fairy]

I would say the same thing as scotty, open cpu-z while running the bench and see if it is an issue with the bench software

[Khai Nguyen]

49 minutes ago, Paula_The_Butter_Fairy said:

I would say the same thing as scotty, open cpu-z while running the bench and see if it is an issue with the bench software

CPU-z report the same prequency as aida64 which bounce between 4.2-4.5 ghz when the max is 4.7ghz

I used the benchmark tool in cpu-z, the cpu does run fix at 4.7

[Khai Nguyen]

57 minutes ago, scottyseng said:

The CPU temps were okay right? Hmm, that is pretty strange for the other programs not to make go to max clock. Have you used another program like CPU-Z just to double check the CPU clock speed?

51 minutes ago, Paula_The_Butter_Fairy said:

I would say the same thing as scotty, open cpu-z while running the bench and see if it is an issue with the bench software

CPU-z report the same prequency as aida64 which bounce between 4.2-4.5 ghz when the max is 4.7ghz

I used the benchmark tool in cpu-z, the cpu does run fix at 4.7

[Paula_The_Butter_Fairy]

very strange you might want to contact intel

[scottyseng]

2 minutes ago, Khai Nguyen said:

-snip-

and if you use another benchmark like Intel Burn Test, does CPU-Z report the clock as being fixed at 4.7GHz?

 

This is pretty strange. Oh, how hot does the VRM (the heatsinks around the CPU get? I doubt it, but maybe they're getting too hot?

[Khai Nguyen]

17 minutes ago, scottyseng said:

and if you use another benchmark like Intel Burn Test, does CPU-Z report the clock as being fixed at 4.7GHz?

 

This is pretty strange. Oh, how hot does the VRM (the heatsinks around the CPU get? I doubt it, but maybe they're getting too hot?

I just try intel burn test, it run at 4.7ghz at the beginning of the test then drop to 4.2ghz. I also tried prime95 and it only run at 4.2ghz.

 

For cinebench, it bounce between 4.5 and 4.7, but it mostly stay at 4.5. I only get 974 for the CPU score.

 

VRM is fine, around 40C (temp under the motherboard section in HWmonitor right?)

[scottyseng]

13 minutes ago, Khai Nguyen said:

-snip-

Curious, how do you have the OC set? Via software or motherboard BIOS?

[-rascal-]

At stock settings, the i7-6700K is rated at 4.0 GHz, and UP TO 4.2 GHz Turbo Boost.

It will only reach 4.2 GHz if the power, voltage, temperature, and workload (e.g. number of cores in-use / idle) allows.

 

http://www.intel.com/content/www/us/en/architecture-and-technology/turbo-boost/turbo-boost-technology.html

Quote

Due to varying power characteristics, some parts with Intel® Turbo Boost Technology 2.0 may not achieve maximum turbo frequencies when running heavy workloads and using multiple cores concurrently.

 

Availability and frequency upside of Intel® Turbo Boost Technology 2.0 state depends upon a number of factors including, but not limited to, the following:

• Type of workload
• Number of active cores
• Estimated current consumption
• Estimated power consumption
• Processor temperature

 

Also, post screenshots of your BIOS settings.

How are you setting the 47x ratio for 4.7 GHz?

What voltage(s) are you using?

 

What ARE your system specifications?

- CPU Cooler?

- GPU?

- Power Supply?

- Case and airflow?

[Khai Nguyen]

1 minute ago, scottyseng said:

Curious, how do you have the OC set? Via software or motherboard BIOS?

Turbor,EST, C State enabled, XMP profile off, "Adaptive + Offset" mode for vcore, cpu voltage is 1.35 with 0.04 offset.

 

The voltage drop (vdroop) when testing with realbench and other stress test, but my motherboard doesn't have vdroop or llc setting so I use offset instead, and the system is stable with about an hour of stress test using realbench (cpu does run fix at 4.7 with realbench)

[Khai Nguyen]

22 minutes ago, -rascal- said:

At stock settings, the i7-6700K is rated at 4.0 GHz, and UP TO 4.2 GHz Turbo Boost.

It will only reach 4.2 GHz if the power, voltage, temperature, and workload (e.g. number of cores in-use / idle) allows.

 

http://www.intel.com/content/www/us/en/architecture-and-technology/turbo-boost/turbo-boost-technology.html

 

Also, post screenshots of your BIOS settings.

How are you setting the 47x ratio for 4.7 GHz?

What voltage(s) are you using?

 

What ARE your system specifications?

- CPU Cooler?

- GPU?

- Power Supply?

- Case and airflow?

I am using kraken x61

750W PSU

R9 390

NZXT s340 case

74C max after about an hour testing with realbench at 4.7ghz (voltage settings are in the picture, and again, cpu run at max speed when using realbench)

[Khai Nguyen]

On 1/19/2017 at 9:50 PM, -rascal- said:

At stock settings, the i7-6700K is rated at 4.0 GHz, and UP TO 4.2 GHz Turbo Boost.

It will only reach 4.2 GHz if the power, voltage, temperature, and workload (e.g. number of cores in-use / idle) allows.

 

http://www.intel.com/content/www/us/en/architecture-and-technology/turbo-boost/turbo-boost-technology.html

 

Also, post screenshots of your BIOS settings.

How are you setting the 47x ratio for 4.7 GHz?

What voltage(s) are you using?

 

What ARE your system specifications?

- CPU Cooler?

- GPU?

- Power Supply?

- Case and airflow?

help me please (

[Paradine Sage]

Flip CPU Ratio Mode from Dynamic to Fixed and see if it passes stability testing.

 

You could have an unstable OC and the board is downclocking to prevent a crash. Prime95, Aida64, and Realbench all stress systems in different ways and just because something is stable for one doesn't mean that it is stable for all of them.

[-rascal-]

23 hours ago, Khai Nguyen said:

help me please (

I agree with @Paradine Sage.

Tweak your overclock and keep all the settings as Fixed for now.

Keep your CPU frequency and voltages fixed constant; you can always adjust them at the end.

 

Personally, this is what I DO as well when I am testing / tweaking my overclocks.

Once I'm done and satisfied, THEN I go a re-enable power saving features, and change things to Dynamic, or adaptive, etc.

I did that for my i5-4690K, and I'm doing that again with my i7-6800K.

• Do 47x for all cores
• Set your Ring Ratio to 40x ~ 42x (about 500 MHz less than your CPU ratio)
• CPU Ratio Mode to Fixed
• Set the Core Voltage to run at 1.37V constant (don't run it on Adaptive + Offset)

The Core Voltage for 'Skylake' CPUs range by quite a bit for 4.5 GHz ~ 4.7 GHz.

Our LTT Overclocking database itself, has a bunch of i5-6600K and i7-6700K's doing 4.6 / 4.7 GHz, but the voltage range from 1.25V all the way to close to 1.4V.