one core temp way higher than others

elliotuk

elliotuk

elliotuk

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Joined
9 Sep 2012
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19
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
 
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?
 
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
 
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?
 
i dont have the stock cooler as i bought the cpu as OEM, but i might see if i can rotate the cooler later good idea.

With the lapping i spent hours working my way down from 400 grit all the way to 2000 grit to get a really high polish, was proper shiny! dunno how you could get such a finish in 10-15 mins :O
 
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