Prime95 28.5 crazy high temps?

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Alex Kelly

Alex Kelly

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Hey guys :) I've been trying to get more out of my 4670K lately, and decided to update Prime95 from 27.9 to 28.5, since doing this, my max temps have shot up from 74C to 82C with a voltage of 1.8, after running Small FFTs for over an hour. Should I be concerned? My temps in Intel Burn Test are exactly the same as what they were before at 74C.

I've pushed my voltage up to 1.2 and I'm seeing if I can get 4.4Ghz stable, but my temps in IBT after 10 passes went to a max of 81C. Is this too high? I'm going to run some Small FFTs again now with this voltage and see if it's stable/my temps go above 86C.

Also, if I keep my cache frequency the same while raising my voltage and multiplier on the Vcore, do I need to raise my cache voltage too? My cache is currently at 3.8Ghz with a voltage of 1.165.

Btw, I'm using a Corsair H90 AIO. It's fan is horribly loud... Going to replace it soon.

Thanks guys. Any advice is much appreciated. Is anyone else getting much higher temps with the new version of Prime? :)
 
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ingtar33

ingtar33

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Dec 17, 2012
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sounds like you're coming up on the limits of your chip. 4.4ghz is a pretty common cap for haswell, especially if you don't delid the cpu, or have a serious cpu cooler. furthermore even with deliding, and a better cpu cooler most people can't get past 1.3V on the vcore, so it's not like you'll get a pile more out of the chip anyway.

As for your temps... yeah, they're warm... but it's not like you'll see those temps under day to day usage situations. think of prime95 as a huge worse case scenario system test. if you can pass there isn't anything out there that will come close to stressing your system's cooling/stability like it will. Now if your system was running 24/7 at 85C... yeah that would be too hot and eventually your cpu would die. But those are fine temps in a stress test.

 
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Alex Kelly

Alex Kelly

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Okay, thank you for your response. I'm scared of frying my Z97 Gaming 3 as it only has 3+3 VRMs, or whatever they're called. I've tried to run at 4.4 with lower voltages like 1.18 before, but couldn't get through stress testing, and if i did, I'd blue screen in a game and it would scare the crap out of me. So I won't be going any further than 4.4, if I can even get this stable.

I'll go check on my PC now (I can't watch it as for some reason I am terrified of BSODs suddenly appearing, I have no idea why it's been a long term fear of mine since I was a kid hahaha). If it's gone near 85C I might just stick with 4.3 at 1.8V.

Thanks again. :)
 
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ingtar33

ingtar33

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when overclocking, blue screening typically isn't a cpu voltage issue. when you hit a blue screen you're typically talking about ram/northbridge issues.

generally when a cpu is undervolted you'll simply crash out of the program to the windows desktop, parts of the OS might stop working, or you'd black screen restart (no blue screen, the system would simply restart without warning)

when there is an issue with ram/northbridge stability you'll blue screen all day long. if you bump the voltage to your ram a little you might be able to stabilize that overclock.

 
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Alex Kelly

Alex Kelly

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Weird. I've always gotten MACHINE_CHECK_EXCEPTION BSODs when OCing with too low of a voltage, and it's been fixed after raising the Vcore slightly.

I just checked Prime, and it found an error. Said something like FATAL ERROR: Rounding supposed to be 0.4 but was 0.49. Hardware fault detected. Does this mean I'd need to raise my Vcore past 1.2 for an OC of 4.4? My temps were hitting 82C on the hottest core, the exact same what it hit on 1.18v. I'd rather not push it past this, though. Prime was taking 1.224v even though I've set it to override 1.2 in my BIOS. Weird.

I've reverted to my 4.3Ghz 1.8v OC for now. After the error in prime, the test continued but my 2nd core temps in Prime looked way too low.. Scared I've broken something. I know it's pretty much impossible but I suppose if it's causing me this much anxiety I should just stick to my stable OC.

Thanks again for your time, much appreciated. :)
 
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ingtar33

ingtar33

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meh... everything is different... I've powered through ram issues with more vcore too... only to find in the end the system isn't truly stable and doesn't stabilize till i get the ram dialed in. Not saying that's the case here, just pointing out that overclocking is mostly trial and error.
 
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Alex Kelly

Alex Kelly

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Yeah, you make a good point. I've had a lot of trouble with my Gskill RAM and MSI mobo, I needed to run at timings higher than they were rated for a long time, but since a new bios update I've been running it at 8-8-8-24 and it's been perfect.

Thank you very much for your time. :)
 
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