How much can I OC 4770K with NH-d14?

Solution
You can overclock it upto 4.5 - 4.6 GHz with Noctua NH-D14. However, true potential of overclock is simply your luck because overclocking potential varies from chip to chip even though the model is same i.e 4770k

Blubberykollis

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Alright. Should I try 4.4 or 4.2 first?

Just to be safe
 
You've to go step by step. Overclocking is time taking activity and you'll be restarting your PC many times to make changes in the multipliers/voltages till such time your all components sync in well and system remains stabilize after hours of continuous operation. Achieve as much as the system allow. Keep the temps under w tab and ensure that PSU is providing the sufficient juice to the components

Good Luck
 

Blubberykollis

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I have a 1000W +80 gold certified PSU. If that is to any help.