i7 6700K, Temps jump to 90°C when under load

[Jeyvii]

My System:
PSU: BE QUIET! Dark Power Pro P10, 750 Watt
RAM: Corsair Dominator Platinum DDR4 16 Gb (2x8) Cl15, 3000Mhz
CPU: i7 6700K
MOBO: ASUS Z170-A
GPU: MSI GeForce GTX 1080 GAMING X 8G
Primary Monitor: Benq 2411T @ 144Hz
Secondary '' : Acer P246H @ 60Hz
Cooling System: Alphacool NexXxoS Cool Answer 240 LT/ST

Hey guys,
I bought myself a new Motherboard, together with a new CPU and RAM.
My problem is, that when i try to set my Core Clock to 4.5 Ghz @ 1.3V or even lower, i get extremely high temps as soon as i run the stress test in Prime95. My temps when on idle are mostly at 24°C.
I tried various different Voltages from 1.26 - 1.325V but it didn't change anything. As soon as i start the Small FFTs mode in P95 the Temperature jumps to 90°C after 5 seconds.
When running Stock settings the Temps dont exceed 74°C, which are kinda high already.

 

[Suztera]

Use ASUS Realbench or Prime95 v26.6. Don't use any prime95 version higher than 26.6.

 

[Jeyvii]

Hi and thanks for your quick reply. I downloaded the 26.6 Version and i get completely different temperatures now.
Im running my CPU on 4.5 Ghz @ 1.325V and the highest temp so far is 80°C and it didn't crash either yet.