Quote Originally Posted by SoLoR View Post
i have same issue on my q9450, cores 0&1 are allways around 8-10 degrees higher then 2&3, remouted heatsink 2-3 times, even lapped it once, it doesnt makes a difference, then someday during prime95 test i noticed, that each time when core 0 or 1 will fail, failed core will starts to read temperature from other core, so i think its bugged/stucked sensors and i stoped caring about temperatures on core 0&1 and i just take 2&3 as only ones valid under stress... problem is linpac sometimes on hot day can get core 0&1 on 95 degrees and that turns on thermal throttling but like i said that exceptional on very hot day, when i get temperatures inside case over 40 degrees, so i dont mind much...
No i think the problem is the IHS is concave in that area and it is causing a Air bubble or a GAP there in which the heatsink is not making 100% contact.

The sensors are not stuck as if you use RealTemp you can Test the Sensors for movement in which my move np's.

I lapped my Ultra 120 Extreme 2 days ago now and it dropped temps 5-6C from previously when not lapped at Idle.

But under full load it dropped maybe 2-3C, but it is still MID 60's-65C-^8C on average on those 2 cores where as the other two are 8-10C less.

I think i may have to lap the CPU, but i hate to do so cause of warranty, but i not care in one way as i can afford another one if need to be, but it would suck if it did die.

Now cause the Thermalright Ultra 120 Extreme is LOOSE when installed this can cause a 4C-5C increase in those cores expecially if the IHS is concave in that area .. now add heat to the issue and that is another 4C-5C increase making the total overall 8-10C increase on those 2 cores alone.

I may try to use a dime or penny or a 1/8 washer ynder the retention bracket to try and get it to be a tighter fit and see how that works out .. with new Paste of course.

I using AS5 right now, but i am going to try the thermalright Chill Factor stuff as in many reviews it is about 2-3C less then AS5 and NO BREAK IN period.