i7 4790k OC Stress Test Inconsistent Temperatures

[CLight]

Thanks for taking the time to read this. I recently decided to overclock my CPU and did a bit of research here and there. I saw Linus' YouTube guide for overclocking the 4790k, and he mentioned that some asus motherboards are able to overclock your CPU for you with more conservative settings using their "EzTuning" cpu overclocking wizard. So I did it, and it overclocked my cpu to 4.5ghz with auto vcore. I restarted my pc and went into the bios again to check the settings, and I noticed that it increased the overclock to 4.8ghz with auto vcore as well. I wanted to run some stress tests so I set the vcore to manual 1.3v. Now here is what's concerning me, when I ran Prime95 my temps instantly spiked to 90+ and hitting 100 on some cores. I stopped the test right away and ran Aida 64 for 10 minutes. Using Aida64 Extreme, my temperatures hovered between 54 and 76 (spiking to 80 once). Is my overclock stable? Should I run Aida64 for a longer duration or lower the settings? I am using a corsair h100i as my CPU cooler and Asus Maximus VII Hero motherboard. My Idle temps are 24c on all cores, and hovers between 32 and 43 while running some games or 3dmark Firestrike. 

[SeanBond]

Doooooooooo noooooooot run prime 95 with a haswell cpu. That's all. The issue is prime95 overvolts the cpu even more than it already is. So you can pretty much blow it up.

[LemonSpice]

Doooooooooo noooooooot run prime 95 with a haswell cpu. That's all. The issue is prime95 overvolts the cpu even more than it already is. So you can pretty much blow it up.

this so much put on manuel voltage

[CLight]

this so much put on manuel voltage

 

It was on manual voltage when I ran the test. 

[Altecice]

 

It was on manual voltage when I ran the test. 

 

 

Ok as above DONT use Prim95.

 

Explanation:

When using stress tests like Prime95 (version 26.6 or above) it uses a type of code called AVX code. This makes haswell CPU's add more voltage to the CPU. When Prime95 comes along with its unusual load it makes Haswell add a stupid amount of Vcore to its self (to the point of doing serious damage CPU) and your temps will shoot up to high 90's even at stock!.

 

Use Aida64 OR Prime95 26.6 or below and you will be safe.

[CLight]

 

 

 

 

Ok as above DONT use Prim95.

 

Explanation:

When using stress tests like Prime95 (version 26.6 or above) it uses a type of code called AVX code. This makes haswell CPU's add more voltage to the CPU. When Prime95 comes along with its unusual load it makes Haswell add a stupid amount of Vcore to its self (to the point of doing serious damage CPU) and your temps will shoot up to high 90's even at stock!.

 

Use Aida64 OR Prime95 26.6 or below and you will be safe.

 

I see. Do you think the short duration I ran it for could've caused some damage? Also, does this mean my overclock is alright? Thanks for the reply!

[Altecice]

I see. Do you think the short duration I ran it for could've caused some damage? Also, does this mean my overclock is alright? Thanks for the reply!

 

Im sure it will be fine as long as you never let it run for any length of time. I also found this out the hardway... Stick to AID64 to test the OC and see if its stable or not

[CLight]

Im sure it will be fine as long as you never let it run for any length of time. I also found this out the hardway... Stick to AID64 to test the OC and see if its stable or not

I'll let it run overnight and see how it goes, but are temps between 54 and 77 ok considering it's a stress test? If not, what are acceptable temps?

[Legitsu]

if your voltage is spiking above 1.35v under prime then guess what your vcore target is too high 

the CPU is adding voltage because it needs the extra power to remain stable under extreme avx load its normal and its per intel spec you just need to pay attention 

and ensure when you test with prime that the total vcore remains under 1.3 that way there is no possible way it will exceed 1.30v ever

because its only prime95 that can cause the cpu to dump extra voltage anything that uses a lot of AVX or lots of FPU stress will do it