Very high temp 6700k Aio

Jun 14, 2018
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I have a 6700k with h100i from corsair on a z170a, what seems like good case air flow, but i have really high temperature spike when on full load or stress test, even on low VCPU (1.23).

After a little while i get average 85-90 on aida with a bit of thermal throttle. I tried some overclock/undervoltage, but i get more of less the same result. I reseated the cooler, changed Thermal paste. Same thing.

Could it be bad motherboard/cpu or even cooler ?
 
Jun 14, 2018
2
0
10

Idle temps are around 30-40C, Fans definetly works, the pump too, the cooler get to 40C max during stress test.