Prime95 on 4670K?

[TrickyWitcher]

I have a 4670K, at STOCK speeds(3.4GHz), with a Noctua NH-L9i mITX cooler. I maxed at 85C before I quit the program for fear of damage. Is it normal to get this high on Prime95 blend? Or is Prime95 just funky with Haswell?

[Tedster]

This may help.

 

http://www.overclockers.com/forums/showthread.php/751197-Prime-95-v28-5-Haswell-CPU-s-and-you-is-it-bad-for-the-CPU-s-health

[xBlizzDevious]

I have a 4670K, at STOCK speeds(3.4GHz), with a Noctua NH-L9i mITX cooler. I maxed at 85C before I quit the program for fear of damage. Is it normal to get this high on Prime95 blend? Or is Prime95 just funky with Haswell?

 

I'm afraid I don't know for certain, but I have definitely heard that Prime95 is "funky" with Haswell.

 

The cooler you said you're using isn't a very big cooler, but I'd still expect it to be capable of cooling a 4670k at stock settings without any issues. What's your case airflow like?

[TrickyWitcher]

I'm afraid I don't know for certain, but I have definitely heard that Prime95 is "funky" with Haswell.

 

The cooler you said you're using isn't a very big cooler, but I'd still expect it to be capable of cooling a 4670k at stock settings without any issues. What's your case airflow like?

NZXT H440 and using all stock fans.

[Queek]

I have a 4670K, at STOCK speeds(3.4GHz), with a Noctua NH-L9i mITX cooler. I maxed at 85C before I quit the program for fear of damage. Is it normal to get this high on Prime95 blend? Or is Prime95 just funky with Haswell?

The why has been covered by Tedster, but in an extremely simplified statement: prime95 makes Haswell and Devil's Canyon processors run very very hot.  You should only run stress tests while on MANUAL voltage only.  

 

Switch to manual voltage before stress testing, and consider using a different stress test for this chip.  Personally I used AIDA64 to validate my 4690k overclock.  

[TrickyWitcher]

The why has been covered by Tedster, but in an extremely simplified statement: prime95 makes Haswell and Devil's Canyon processors run very very hot.  You should only run stress tests while on MANUAL voltage only.  

 

Switch to manual voltage before stress testing, and consider using a different stress test for this chip.  Personally I used AIDA64 to validate my 4690k overclock.

I heard AIDA64 doesn't put as much of a load as Prime95, either way, it should give a good idea of my cooler's performance. Also, my 4670K was at 90C for around 10 seconds while running prime95, do I have to worry about damage?

[Queek]

I heard AIDA64 doesn't put as much of a load as Prime95, either way, it should give a good idea of my cooler's performance. Also, my 4670K was at 90C for around 10 seconds while running prime95, do I have to worry about damage?

Some may disagree, but I would say that the real stress test is how you use your system in a day.  Using a stress testing utility will give you a general idea of the stability of the system.  I used AIDA64 to generally validate my 4690k overclock, and then over the course of the next month, if I had a blue screen, I tweaked the voltage slightly.  It only resulted in two overclocking failures, so I'm okay with that kind of testing.  

 

Given how hot prime95 gets on these processors (and how my system will never be taxed that hard), I chose to go with AIDA6.  You can use prime95 if you want, but from what I gather, it doesn't validate Haswell or DC overclocks very well (read the link above).  

 

I chose to keep my processor below 70°C on AIDA64, but you can choose whatever you want.  Thermal throttling hits at ~100°C for your processor, and most people will probably tell you that you should keep your temps below 85°C.  Hitting 90°C shouldn't have damaged your processor, but it's best to keep it lower than that.  

[typographie]

I heard AIDA64 doesn't put as much of a load as Prime95, either way, it should give a good idea of my cooler's performance. Also, my 4670K was at 90C for around 10 seconds while running prime95, do I have to worry about damage?

 

90°C is too high in my opinion for continuous operation but it certainly won't hurt the chip over 10 seconds. At any rate my understanding is that the concern with Prime95 isn't temperature per se (though that's related) but rather the core voltage raising to a dangerous value. I just wouldn't use it at all with a Haswell processor.

 

Definitely use AIDA64, and while I haven't used it myself I've heard OCCT is another good alternative. I think AIDA64's load is enough to make a determination of stability for most gaming machines. If you need to guarantee 100% perfect stability (like for a workstation, I guess), you probably shouldn't overclock.