Is this cpu core temp difference normal?

[Leviathan888]

Hi. While running Cinebench to stress test a system I got, I noticed the cpu core temps had some large differences. Its an i7-4790k that has a history of being unstable, so i've been messing around in the bios trying to get it to stop crashing (hence why its running 3 cores, I was seeing if disabling cores would fix it). The picture below shows HWinfo while running cinebench. I noticed up to an 11 degree difference between core 0 and core 2 sometimes. Is that within reason or is the cpu dying, which is what I kind of think. (After I ran prime 95 for about 20 minutes, with a constant 10 degree difference between core 0 and 2)

 

 

[Bitter]

I believe the 4790K's were TIM between the die and IHS and that stuff does degrade over time. I've delidded a couple 4th gen and replaced the TIM with newer better stuff and I've seen a good lowering of delta's core to core on them, the lowered temps even let me run one of them passively cooled. Those don't look like terrible numbers but if you're comfortable with a de-lid I bet you can get those numbers lower with better compound or liquid metal.

[CommanderAlex]

1 hour ago, Leviathan888 said:

Hi. While running Cinebench to stress test a system I got, I noticed the cpu core temps had some large differences. Its an i7-4790k that has a history of being unstable, so i've been messing around in the bios trying to get it to stop crashing (hence why its running 3 cores, I was seeing if disabling cores would fix it). The picture below shows HWinfo while running cinebench. I noticed up to an 11 degree difference between core 0 and core 2 sometimes. Is that within reason or is the cpu dying, which is what I kind of think. (After I ran prime 95 for about 20 minutes, with a constant 10 degree difference between core 0 and 2)

Definitely for sure, as @Bitter has said, that Intel used TIM instead of solder between the die and IHS and has most likely dried up at this point. 

[unclewebb]

@Leviathan888

Your temperatures are fine. 

 

Why are you running your CPU way below its rated speed? Your low core speed with a higher cache speed will create instability. 

 

The voltage looks too low. Increase the CPU speed and increase the voltage until it is stable.

1 hour ago, Leviathan888 said:

history of being unstable

There is nothing wrong with your CPU. Set it up properly.  Why talk about delidding when the hottest core at full load is only 59C?

 

Edit - Have a look at the HWiNFO throttling reasons. If your CPU is power limit throttling, increase the PL1 and PL2 power limits in the BIOS.