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odd E8400 temp issues

post #1 of 15
Thread Starter 
Hi, I just got an E8400 CPU (on a 780I MoBo), and just looked at it in coretemp. One core is at 35C the other is around 45-48C (not load, just when I am looking at webpages and stuff, under load it still keeps the 10* difference though). Is it normal to have temps like this? I have not OCd it yet because I am worried about the temps. The temp in my house is 30C. Why would their be such a difference in the 2 cores? I have the xigmatek 120mm heatsink with 120mm fan and used AS5, I am at stock voltages (I have a full tower Lian Li case with 6 120mm fans, so airflow is not an issue). Should I reseat my heatsink? I do not really want to lap my heatsink, and their is NO way I am going to lap my CPU.
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post #2 of 15
e8400's along with other 45nm chips have a DTS issue.
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post #3 of 15
plus you should be using realtemp instead of coretemp. Its more accurate with the new chips.
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post #4 of 15
Thread Starter 
Wow! Thanks for the light speed reply(s)! So you think this is a software issue? I have heard of a 3-4 degree difference, but 10C degrees? Do you have this same problem? Sorry about all the questions, but this is my first build and I am very concerned about it I will give realtemp a try.
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post #5 of 15
or your heat sink is not seatted properly id be going with that myself
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post #6 of 15
Quote:
Originally Posted by ChIck3n View Post
Wow! Thanks for the light speed reply(s)! So you think this is a software issue? I have heard of a 3-4 degree difference, but 10C degrees? Do you have this same problem? Sorry about all the questions, but this is my first build and I am very concerned about it I will give realtemp a try.
I have another E6300 with a 7c temp difference between cores. I remounted the cooler on that one 5 times, but didn't fix it. You can fix it by lapping, but didn't want to do that either.

Anyway, try getting a tool that will read the correct temps first...
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post #7 of 15
Thread Starter 
I tried real temp, 25C and 35C. I like these temps better, but still 10C difference. I suppose I will try reseating the heatsink. I need to install some new drives tomorrow, so I will have my case opened up, might as well try then. Now that I think back, the heatsink did not go on as "smoothly" as it should have. Any recommendations on the best way to clean AS5 off a heatsink/cpu? I have 91% isopropyl alcohol, some fabric, and some oil free optic cloths I use for my binoculars, will that work?
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post #8 of 15
While its fine to reseat the cpu, dont expect anything different. You can load one core, and have the other at idle and get only 1C difference in temp between the two cores as they are much closer together than previous cpus and the die conductivity is ~20x that of tim1. Or to put another way, you are not going to be able to create a 10C difference in E8400 core temps even if you purposely tried to do so by putting tim2 over just one die.
typical thermal conductivities of components...http://www.flomerics.com/files/casestudies/728/t354.pdf

Also it is not a software issue. The thermal sensor on die outputs a digital signal that is read accurately by coretemp, realtemp, etc. Coretemp reads 10C higher because it is guessing tjmax of 105 based on mobile cpus (despite intel saying that is incorrect), and realtemp assumes tjmax of 95 based on measurements of casing temps assuming theta (junction-case) is minimal when cpu is underclocked and undervolted. And displayed temp = tjmax (guess) - DTS (accurately read).

Bottom line the sensors on the new 45nm chips have problems, which I hope intel will fix in the near future, some have more issues than others.

As to which is more accurate, try calibrating your cpu temp to ambient, you might have better luck with it. But idle die temps are overestimated and inaccurate on most all E8400's, realtemp will get you closer to reality for loads though, if you knew which core to believe.
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post #9 of 15
Thread Starter 
Thanks for the detail! I will probably try reseating the heatsink anyway, as it slipped around a bit (and nearly fell all the way off) when I first put it on and I have been debating reseating anyway to get rid of any air bubbles that may be in it. I suppose I will just go by the hotter core; rather be safe than sorry. I will post what happens after I reseat.
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post #10 of 15
you need to lap the CPU i had the same problem before i lapped it and then i just lapped it again yesterday and now my cores are 38C and 39C
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