Hi! I know you can overclock i5-6400 and many other locked CPU's when adjusting base clock. I have compatible bios to change that. My base clock is 102.7 at the moment, because when I rise it to 102.8 or more, it wont work. It reboots several times and then theres ''Overclocking failed! Press F1 to run setup''. How someone got like 4.5GHz with i5-6400 with just adjusting baseclock? Please tell me what im doing wrong or something, or do I need special bios? 
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Speedstep: OFF
Turbo mode: ON
All Powersaving features: OFF
Everything that is recommended to be disabled for overclocking is disabled.
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CPU voltage: 1.2
System Agent voltage (VCCSA): 1.1
RAM Speed: 1600MHz
Multiplier 33x102.7MHz = 3389MHz
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My setup:
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MoBo: ASUS Z170-P
CPU: Intel i5-6400 Skylake
GPU: GTX 960 4GB OC
PSU: Corsair 750w Bronze
RAM: 2x4GB 2133MHz DDR4 (Does not support XMP!)
Cooler: Stock cooler

-
Speedstep: OFF
Turbo mode: ON
All Powersaving features: OFF
Everything that is recommended to be disabled for overclocking is disabled.
-
CPU voltage: 1.2
System Agent voltage (VCCSA): 1.1
RAM Speed: 1600MHz
Multiplier 33x102.7MHz = 3389MHz
-
My setup:
-
MoBo: ASUS Z170-P
CPU: Intel i5-6400 Skylake
GPU: GTX 960 4GB OC
PSU: Corsair 750w Bronze
RAM: 2x4GB 2133MHz DDR4 (Does not support XMP!)
Cooler: Stock cooler