Low Cpu usage under stress test

[Wheaticus]

After overclocking the CPU (i7-5820k) to 4.0 Ghz and successfully booting to windows 8.1 I have tried doing stress test using CPU Z, Prime95, and AIDA 64 Extreme. The results of these test being that even though the programs claim the CPU is being utilized to 100% the CPU is in fact only being used to 1.19 Ghz. This is day 2 of the overclocking experiment and I could really use some help. The end goal being a stable 4.0 Ghz clock speed thank you in advance for any and all help.

 

[GhislainG]

Then it throttles because the cooler is not powerful enough or it isn't installed correctly. Does it run at full speed if not overclocked? If you applied more voltage to overclock, then you need a very good cooler.

 

[Wheaticus]

Then it throttles because the cooler is not powerful enough or it isn't installed correctly. Does it run at full speed if not overclocked? If you applied more voltage to overclock, then you need a very good cooler.

I'm using the h 100 I and the heat hasn't gone above 35 C but there is definitely some sort of throttling going on with the cpu (I rechecked the numbers last night) running at 38% under full load from Aida 64 cpu z and prime 95

 

[GhislainG]

When running Prime95, the CPU should be 100% busy and it should run at it's rated or overclocked speed. If it doesn't run at the expected speed, then your cooler either is defective or it isn't installed correctly.

 

[Wheaticus]

How would you discern whether the cooler was installed correctly? The Corsair Link program works and shows all data associated with H100i cooler and detects temperatures of the CPU and adjusts itself accordingly. Also on the motherboard, I rechecked the connections for the cooler including the CPU fan header connection, the USB connector which is linked to the Corsair pump hub is also functioning. Is there a software diagnostic I can run to check the validity of the system as is?

 

[GhislainG]

I'm not familiar with that cooler, but what CPU frequency and temperature does Intel Extreme Tuning Utility display while running Prime95?

 

[Wheaticus]

Which test do you use on Prime95??

 

[Wheaticus]

The heat got to 42 C with 100% utilization but the program says that frequency is 1.20 Ghz and I used the second test.

 

[GhislainG]

Start by stress testing the CPU with Intel Extreme Tuning Utility (not really a stress test). The CPU should run at full speed and all cores should be active. If it runs fine and the temperature is good, then try Prime95 Small FFTs, but monitor the CPU closely for the first few minutes to make sure it doesn't throttle.

 

[Wheaticus]

A second test after a two minute cool down has the CPU at a stable 40 C at the same 1.2 Ghz

 

[Wheaticus]

That was the small FFTs test that I ran twice.

 

[GhislainG]

This is not normal. You probably have a setting in the BIOS that forces it to run at low speed. Did you overclock in the BIOS or did you use a utility? If I were you I'd reset the BIOS to the default settings.

 

[Wheaticus]

I just did that should I also clear the cmos I have a gigabyte X 99 SOC FORCE if that helps at all I'm willing to just about anything to make this work

 

[GhislainG]

If clearing the CMOS and everything else doesn't work, then contact Gigabyte and they will help you or ask you to RMA the motherboard. What you haven't explained is how you overclocked to 4 GHz. Based on your initial post, that's when your issues started.

 

[Wheaticus]

I used the gigabyte smart tweak.

 

[GhislainG]

If resetting the CMOS settings doesn't work, then open a support call with Gigabyte and they should be able to identify why Smart Tweak caused that issue. On my less expensive Gigabyte motherboard, I can use the standard BIOS menu by pressing F2. There's a selection where I can set the CPU ratio, maximum power (setting this low enough will prevent the CPU from running at full speed), etc. If you have a similar menu, did you reset all settings to Auto?

 

[Wheaticus]

I did and just double checked how troubling I'm going to try to update the bios to the newest version and hopefully that will mitigate this problem.

 

[Wheaticus]

Upgraded to F5 no improvement could this be a power problem manifesting?

 

[GhislainG]

Was it working properly before you overclocked? If so, then contact Gigabyte support because they should know what their tools do.

 

[Justin Williams]

I have the exact same thing. ASUS X-99A mother board, i7 5820k. Overclocked to 4.4 at 1.3 volts. From researching around this seem to be a good basis to start at. Ran a 4 hour stress test...watched closely for the first 15 minutes...everything seemed legit and running well. Just by chance when stopping the test (in AIDA 64) I glanced at CPU-Z and saw that my clock speed was 1.19 MHz. This is my first attempt at overclocking, and I couldn't remember if CPU-Z had said 4.4 when I started the test, so I restarted my build and sure as shit on restart it said 4.4 again on CPU-Z.

I used the BIOS to overclock, pretty much followed Linus' quick OC tutorial for the 5820K except I messed with BUS speed a little. I ran through the full 4 hours of the test in AIDA64, the CPU throttling was at 0% for the entire test.

Like I said this is my first attempt...please be gentle if I committed any sins for the seasoned OC'ers.

 

[GhislainG]

Why did you mess with the bus speed with an unlocked CPU? Looking for trouble and weird behavior?

 

[Justin Williams]

I messed with the BUS speed because in the Techyes tutorial it said your target for bus speed should be 1 GHz below your clock speed. Did you not read where I said this is my first attempt at overclocking? That I am new to it and learning? Maybe the less douchey thing to respond with is why I shouldn't mess with bus speeds in an unlocked CPU.

 

[GhislainG]

I honestly don't understand why the target for bus speed should be 1 GHz below the clock speed; that doesn't make much sense to me. Changing the bus speed can affect other components and lead to an unstable system.

 

[maddeejay]

After overclocking the CPU (i7-5820k) to 4.0 Ghz and successfully booting to windows 8.1 I have tried doing stress test using CPU Z, Prime95, and AIDA 64 Extreme. The results of these test being that even though the programs claim the CPU is being utilized to 100% the CPU is in fact only being used to 1.19 Ghz. This is day 2 of the overclocking experiment and I could really use some help. The end goal being a stable 4.0 Ghz clock speed thank you in advance for any and all help.

I too have the same problem. ASUS Rampage ii Extreme i920 @ 4.2Ghz 1600Mhz DRAM. X58 chipset

intel Speedstep/C1e disabled. BIOS reports 4.2Ghz BCLK 200 multiplier 21.

Prime 95 small FFT on full load 100% and speed drops from 4.2Ghz x21 Multiplier to 2.5Ghz x13 Multiplier.

This is very weird! any ideas?

Extreme OV is disabled at the moment. Should I enable this so the CPU can get more power when Prime95 goes 100%?

 

[maddeejay]

I have found the issue CPU TM Function was enabled.

I have now disabled CPU TM Function and system ran at full 4.2Ghz without dropping speed or multiplier in CPUZ

Unfortunately my CPU overheated and the system crashed.

I've had to drop my overclock down to 3.8Ghz due to insufficient cooling.

Hope that helps.