Go to bios
Advanced Mode
AI Tweaker
Set CPU Core Ratio to Sync All Cores
Set 1 Core Ratio to 40, that sets all cores to 40
Scroll Down
Set Core Voltage to Adaptive Mode
Exit
Save and Reboot
OPTIONAL
Set CPU Fan Profile to Turbo for best cooling
Set other fan's modes to what ever you want
Set fan speed low limits to 200rpm, dont set them to ignore mode or you wont get to know if some of your fans has failed
Exit
Reboot and Save
P.S. Install and run Prime 95 for ~1-10 hours to see if your cpu runs stable. I recommend at least 3 hours with Custom mode, with following settings:
Number of torture test threads to run: 4
Min FFT size in K: 1
Max FFT size in K: 4096
Untick Run FFTs in.place
Memory to use in MB: Set to ammount of RAM that you got.
Time to run each FFT size in minutes: 10
All done.
Mobo: Asus Z87-A
CPU: Intel i5-4670k
Cooling: Corsair h100i
