CPU Manual Voltage won't increase

[Jonjon627]

Hey guys, I'm trying to overclock my i5 3570k CPU to around 4.4 GHz but this requires increasing the voltage to the CPU a bit.
I have a problem when I try to increase my Manual CPU Voltage. Everytime I try to change it to something like 1.210v or 1.250v is just appears in red and im worried that my PSU isn't powerful enough or something like this.
btw I'm kind of a noob at this XD

Specs relevant
CPU: i5 3570k
Motherboard: ASUS P8Z77-V LK
PSU: Corsair HX750W Power Supply
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[bebop460]

Unless you're pushing several high end GPUs that you're not mentioning, a 750w should be more than enough juice.

Be sure to test your memory with Memtest and P95 blend after you're happy with the CPU oc, as it may no longer be stable. This will save you from potential OS corruption/data loss from running unstable memory.