Prime95 tests

[blakslee720]

Hey everyone,

So I recently put a 4670k and hyper 212 evo into my pc and decided to start overclocking. So far I've had temps going past 90 degrees C running small fft in prim95 at 4.2 ghz which to my mind is too high. The cpu seems much happier at 4.1 which stays in the mid/high 70s

 

Temps then drop a lot if I run Blend or Large fft, which as far as I can work out is because those tests aren't at stressful to the CPU. IE running at 4.5 ghz in a blend test has temps hovering around 70 C. I left voltage on auto in the BIOS (maybe not the best idea?) and CPU-Z showed voltage going between  1.277 and 1.360

 

I have yet to run a full 8 hour or so on prime95 because I want to try and dial in the ghz/temps I want before setting aside a large chunk of time to monitor my pc and have been getting the posted temps by letting it run for just a few minutes.

 

So my overall question is for CPU OC stability which test should I rely on? 4.5 ghz would yield unacceptable temps in Small fft but in blend and large fft the temps stay under 80.

[dragoon20005]

Aida64 and OCCT and Intel Extreme Tuning Utill

 

nvr use Prime95 to test Haswell CPUs

[CoolaxGaming]

Aida64 and OCCT and Intel Extreme Tuning Utill

 

nvr use Prime95 to test Haswell CPUs

That's only a problem if you use adaptive voltage

[Faceman]

Prime95 is fine to use, you just have to be a pro and set your voltage to manual/constant/override/static before stress testing, with any program, but especially Prime95.  When done stress testing, revert back to adaptive.

 

The custom settings I use for P95 are: Threads = 4, Min FFT Size(in K) = 8, Max FFT Size(in K) = 4096, Memory to Use(in MB) = 1600, Time to Run Each FFT Size(in Minutes) = 3.  With these settings I get 42 tests done per 20 Minutes.  I find that if I pass that, I am rock hard stable.

[Raudi_]

I second what @Faceman said, when doing any CPU Benchmarking/Stressing ABSOLUTELY set the voltage to manual/constant/override/static with any Haswell CPU otherwise you will see the CPU start overvolting its self. I was stressing once and I set 1.25v in my BIOS when stressing it jumped to 1.32v cause it was adaptive.

[blakslee720]

So a few quick lessons I've picked up so far (please feel free to add)

1. See what happens in Aida64, OCCT and/or Intel Extreme Tuning

2. Use fixed voltage to dial in stable OC, then switch back to auto

3. Try Faceman's prime95 settings

[Queek]

So a few quick lessons I've picked up so far (please feel free to add)

1. See what happens in Aida64, OCCT and/or Intel Extreme Tuning

2. Use fixed voltage to dial in stable OC, then switch back to auto

3. Try Faceman's prime95 settings

1) yes.  Prime95 churns out a lot of heat for haswell chips, and from what I understand doesn't actually validate the overclock.  AIDA64 and the other are usually recommended for haswell or devil's canyon chips

2) yes. always use fixed voltage while validating an overclock, but switch to adaptive after you have something good (auto will just put it back to default settings)

[blakslee720]

1) yes.  Prime95 churns out a lot of heat for haswell chips, and from what I understand doesn't actually validate the overclock.  AIDA64 and the other are usually recommended for haswell or devil's canyon chips

2) yes. always use fixed voltage while validating an overclock, but switch to adaptive after you have something good (auto will just put it back to default settings)

So new problem. I go in and fix the voltage to 1.1 w/a 4 ghz clock speed, then "save changes and reset" to exit the bios (asus z87 gryphon btw) and then the screen goes blank and the pc doesn't actually reboot.

 

So i turn it off via the power button, unplug the PSU and then it boots so I go right into the bios and put the voltage back to auto.

[Faceman]

So new problem. I go in and fix the voltage to 1.1 w/a 4 ghz clock speed, then "save changes and reset" to exit the bios (asus z87 gryphon btw) and then the screen goes blank and the pc doesn't actually reboot.

 

So i turn it off via the power button, unplug the PSU and then it boots so I go right into the bios and put the voltage back to auto.

Probably need more than 1.1v then.

[blakslee720]

Probably need more than 1.1v then.

Still wont boot up to 1.25v.

 

Enabling extreme overvolting didn't work

I forget the field but bios is currently ratio first rather than bclk

[Faceman]

Still wont boot up to 1.25v.

 

Enabling extreme overvolting didn't work

I forget the field but bios is currently ratio first rather than bclk

Revert back to default then try again.  Maybe you accidentally did something weird.