I said start at 1.25v. After you set your system to 1.25v start increasing the bclock until it wont boot into windows. Then increase the vcore some more.
Read some guides on overclocking, you seem pretty clueless. Come back when you have questions.
Your wiring is pretty bad. you may want to re arrange your wiring and tuck in the wires to get better air flow. It just looks very messy. Better airflow = better cooling (overclock).