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Core 1 20-30 degrees hotter than the rest

post #1 of 3
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I had to install a new motherboard while mine is in advanced RMA. Since then the core 1 is 20-30 degrees hotter than the rest, often gets to 100 C which is the threshold to 0 and then I often just crash. All the other cores stay at about 60.

I have removed and re-seated the heatsink several times, applied thermal paste thin or just a blob. still the same.

Any suggestions? I know that the cores are supposed to have different temperatures, but not that of big ones....
Edited by dante`afk - 8/2/16 at 4:58pm
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CPUMotherboardGraphicsRAM
i7 8700k @ 5.2Ghz asus maximus hero X Z370 EVGA FE 1080Ti 2050/5800 32gb g.skill tridentZ RGB 3600@4133 
Hard DriveHard DriveHard DriveHard Drive
3x WD Caviar Black 4TB Samsung 960PRO NVMe 512gb Samsung 960EVO NVMe 512GB Sandisk Ultra II 1TB 
CoolingOSMonitorMonitor
1x corsair h115i, 1x h90 Win10 x64 pro ASUS ROG PG279Q Gsync @ 165hz 2x Qnix 2710 Evo II @ 120hz  
KeyboardPowerCaseMouse
CM Storm QuickFire XT corsair ax1200i corsair carbide 540 Roccat Pure Optical 
Mouse PadAudioOtherOther
Roccat Taito asus xonar DX 7.1 KS8000 65 Zoll 4k SUHD Samsung Tab Pro 8.4 
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post #2 of 3
Sounds like a faulty CPU to me if you tried an even amount of full load on the CPU and the 1st core is significantly higher under load as the thermal sensors on Intel CPUs are more accurate at higher temperatures.

What CPU cooler are you using?
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Western Digital 1 TB Pioneer Noctua NH-U9B Windows 7 Ultimate 64-bit 
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Dell Monitor Logitech G110 Antec 750W Thermaltake Aluminium Old Case 
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post #3 of 3
I guess based on the information you've provided... beyond something being faulty the only things I can think of are..

Have you run applications that load all your cores to see if under load they all stay that far apart temp wise.

Are your voltages reporting as expected?

and since you've done the heatsink application over a few times...

By any chance did you get a delid on your cpu? (the same thing can happen on a delid/reseal where the cover will shift and break the tim seal inside. That's why I ask because if that happens you can see that kind of core temp variation.)
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