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Have I damaged my 4790K with Prime95?

post #1 of 8
Thread Starter 
Good day folks, I bought a 4790K recently from a friend (used, never over-clocked) to build my first proper gaming rig. After assembling the computer I decided to to run a couple of benchmarks and stress test to make sure everything is working fine. So I loaded Prime95, ran the "In-Place Large FFT's" test and the CPU temperature instantly sky rocketed to 100C!! I was talking to my friend on phone while I did this so didn't notice it for about 1-2 minutes but as soon as I did I stopped the test immediately. The CPU was running at stock configuration and with the stock cooler. I did not monitor vcore voltage or the power it was drawing, just the temperature...

Now I am kinda worried whether this has damaged my CPU in any way? Is there anyway I can find-out that my CPU is fine and has not taken any damage from this?
If anyone could shed some light on this matter I would highly appreciate it.
post #2 of 8
the cpu is built with an auto shutdown feature if thermal limits are hit. You appear to have not hit those limits so your probably on the safe side. all you did was run the chip really really hot.
post #3 of 8
The one thing you just learned about Haswell/Devils Canyon... They don't like FFT and AVX stress tests very much (Unless you have the means to cool them)... xP
Piledriver Reborn
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Piledriver Reborn
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post #4 of 8
Small FFT'sa are where it really gets bad...
Anyway, the CPU was likely throttling itself (and the board too) to keep it from that magic 105°C. I would not worry about the CPU
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post #5 of 8
Thread Starter 
Yes I googled shortly after the incident and found out that haswell and AVX 2.0 based stressing utility like prime95 doesnt get along nicely. Also people said that AVX2 causes CPU to draw excessive amount of voltage (if set on adaptive, which mine was since its the stock default setting). Thats the main thing that is worrying me, excessive voltage. It may have caused harm to my CPU... Can I find out if its ok or there is no way to tell?
post #6 of 8
It is very unlikely that without touching any settings that your chip pulled more than 1.25V. That high of a voltage would have put out way too much heat and shut down the system. Also, like I said about throttling, it is likely that the chip throttled itself, which decreased voltage and clock speed
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post #7 of 8
Thread Starter 
Thanks for your support guys, I am now having a different problem. I have made a thread about it in the appropriate section, please have a look:
http://www.overclock.net/t/1607319/msi-z97-gaming-5-cpu-fan-strange-behaviour
post #8 of 8
Don't worry in few minutes about 100℃ on i7 4790K. This CPU is naturally hot on any overclock . I had have this CPU 2 years ago iced 4.7Gh and it's at 85℃ in hard games and at 95℃ on hard benches under watercooling! But you said is not under overoclock. All bios parameters origins? Prime is too hard for stock cooling. I think you are not installed your cooling correctly.
Edited by AndRicard - 7/30/16 at 6:57am
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