one core temp way higher than others

elliotuk

elliotuk

elliotuk

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9 Sep 2012
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i've just upgraded my PC with a 3570K cpu, Corsair H80 cooler and an asus Maximus V gene motherboard, however one of the cores is always around 10c higher than the others.

tempssm.jpg


I have tried reseating the HSF a few times, have changed the tmp from standard stuff to arctic silver, have run the cpu at default speeds and overclocked but no matter what I do one of the cores is always far higher than the others.

When I start running prime then 3 of the cores are at an ok 75c but the 2nd core is hitting 85c+ which is really preventing me from overclocking any further.

Is there anything else I should look at? Is it just a problem with the cpu?

thanks
 
It could be just sensor on the core reading high.

Do other software program's show the same.
 
Hmmm mine varies but not as much as yours, think biggest difference i've seen is around 5c between the lowest and highest core.
 
HWMonitor will show you what the load is on each core. It's possible that high core is actually doing more of the work than other 3 cores 28%. Like cores are 5%-38%-5%-3% or 85%-100%-85%-80% individual load.

Or just a bad sensor on one core. Mine is 15-21-22-21-25-21c & .8%-.9%-1.2%-1%-2.5%-.8% load... 15c is not even possible as ambient is 20c. :)
 
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I have one core thats sometimes 10 to 12 degrees lower than all the others. I was told thats quite common but never seen it your way round.
 
look at temps in the bios see verify and if your still not happy i'd reseat the cooler and re-apply thermal compound..

Unless you have an application that is sucking power on core 2..?
 
ok here they all are together, they all seem to agree on the temps, where can i see the load on each core?

temps2h.jpg


also in order to get this 3570K stable at 4.5ghz ive had to wack up the core voltage to 1.35v, is that normal? ive heard some people are getting 4.5ghz+ on like 1.2v, perhaps just a bad cpu?
 
To get mine stable at at 4.6GHz I'm hitting about v1.384 during games, benching & stress testing it hits about v1.4 however my temps are cool as hell (60'C games, 70'C stress tests).

However I think I'm going to re-set my overclock as it was rather rushed and see just how low I can get these volts, it's the first time I've overclocked anything.
 
It just the way things are. Different cores perform different tasks and all tasks are different so use different amount of CPU. That for differences ;)

your screenshot look normal to me. Is it min/max or value/max?
Second column 41.5%-51c & 52.3%-58c looks normal.

Have you tried a stress 100% load test? 3570k Tcase is 67.4c so test can peak up to 80c no problem but not for long periods. Some will say even higher is safe but I would stay below spec to live long and prosper. ;)
 
ye i ran prime95 last night for 10 hours and passed, 4.5ghz, needed 1.32v vcore though, with that the temps maxed out at 75c on 3 of the cores and 81c on the 2nd core. Do those temps seem about right for 1.32v and 4.5ghz? its a corsair H80 cooler.

Looking in task manager now looks like the load is spread evenly across the cores, never mind i guess im just unlucky with this cpu. Maybe the shop will let me send it back? ;d
 
I wonder if the 10 hours may have solved that core's problem?? Like your TIM seated in or maybe chip's internal TIM?? A quick prime test will tell.
 
I expect your thermal compound hasn't spread very well and there to much/not enough around that core.

It's more linkly that your cpu heat spreader is concaved and isn't sitting as well as the outer cores so isn't getting optimal heat transfer.

Or even, the ****e tim used inside the cpu is just crap around that core, I'd firstly reapply compound and heat sink and see, it takes like ten minutes..

Other options are lap the cpu, and then if your still getting the same trouble delid the cpu and apply your own thermal compound.

Or, do nothing and just having it niggle at you lol
 
well ive removed the HSF and reapplyed artic silver about 4 times now, at first i tried an amount the size of a grain of rice and spread it out, next time i tried a pea sized amount, always the same result with that one core being a pain in the ass.

I tried lapping a cpu last year and failed, after like 6 hours of sanding it down it actually made the temps worse. I found out that this was most likely because my HSF was very slightly convex in order to fit the cpu which is usually very slightly concave apprently, so I had to lap the HSF as well but still temps were worse. I dont know if i wanna risk it again, think ill probably just live with it ive managed to get it on 4.5ghz stable with ok temps so that'll do ok.

thanks for all advice anyway :)
 
I've been thinking- if I lap the CPU do I have to lap the HSF? it's a corsair H80 so would be a pain in the ass to lap as its all connected to the radiator etc. I'm not sure if it's slightly concave? if so I guess it would have to be lapped too, if it's designed perfectly flat then I
guess only lapping the CPU would be ok?
 
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