i7 7700k Cores reaching 100 degrees with Corsair H100i v2

[Robert_359]

So i just finished my new build and after checking the temps i was genuinely shocked. While my BIOS CPU temp (don't know how else to call it) hits 66 max under full load, the cores reach over 100. I'm using HWInfo to monitor everything. I re-applied the thermalpaste and no significant differences.

Notes:
The thermal compound is a few weeks old. I lost the cap, but does the formula/effect change? It was still liquid when i pushed it out.

The backplate of the Corsair H100i v2 arrived broken, so i could only screw 2 thumbscrews down diagonally. It's still a tight fit though. I contact Corsair RMA for a replacement backplate, but could this have any effect?

CPU: https://gyazo.com/c514fedd1709511e219d58b2dc5b13e6
MB and Cooler: https://gyazo.com/ddc4b3964ca7b19216af381f45cebbd6

Build:
i7 7700k
ASUS Z270G Gaming
2x 8GB Corsair DDR4 LED
Corsair RM750x
Corsair Air 240
Corsair H100i v2
ASUS ROG A8G GTX 1080

 

[n0ns3ns3]

the thermal paste is fine.
the backplate/mounting is NOT FINE. you should not use it.
check the core frequency and voltage and post the numbers here.

 

[Robert_359]

Thanks for the quick reply and here you go! https://gyazo.com/26057a3a2d758571609f65b564ad97f5

I had some doubts by mounting only 2 sides, yet it's really tight against the CPU/MB. If this really is the deal would you recommend me not using it under full load untill my RMA is completed?

 

[n0ns3ns3]

use something like HWinfo64 or HWMonitor to capture voltages and clocks under full load.

I wouldn't use the system with such temperatures.

Assuming your MB is not pushing some crazy voltages, the issue might be the CPU itself.
there are quite a few reports of "too hot" kaby lake CPUs as intel is again using some poor TIM under IHS.
deliding kaby lakes lowers the temperatures by 20C easily. I don't know how comfortable you would be with such procedure on your new system as it will void the warranty.
Of course such thing should be done after you know everything else is right.

First steps are
* verifiyng voltages/clocks.
* using manual settings for the above
*updating/reseting MB bios
* making sure the cooler is mounted properly with all screws

 

[13thmonkey]

until that backplate issue is resolved don't use it at all.

 

[Robert_359]

I'll wait for the RMA before using it again. I took it off and will be using an Intel stock cooler instead for the time being. Thanks for the advice!