Sorry, but you cannot overclock an i5 4460, it is not unlocked. If your temps are ok and you have resonable airflow, I personally feal it is a must to overclock a gpu, I mean, it's free fps (well, free-ish, higher electricity bill by about 1 thousandth of a cent). Anyway, just download msi afterburner or whatever OC software you want and run A LONG benchmark, so a few hours, just to get a look at temps, power usage, fan speed, performance and all that stuff. Just make sure you make it monitor everything you want. Afterwords, if you still think it's viable (no real reason I can see right now that it wouldn't be, but you never know), just slowly increase the Ghz without increasing the voltage, that way you aren't really drawing much more power and are risking NOTHING. Of course, only increase WITHIN REASON, so very small increments, and when it crashes, go back to the last stable settings. If you want, increase th voltage slightly after this procedure and then repeat, until you reach the thermal limit of your card. I reckon you will be ok with 550W, but don't go crazy, always check temps, power usage and all that. Also make sure you are confortable with the noise, because no one wants to sit next to a jet engine all day.
Do not worry about damaging the card, as long as you have good airflow, the card will cool itself, and if you increase it too much and it gets too hot, then it will only slow down the clock speed (thermal throttle) to male sure it doesn't overheat, if that happens, just stop the benchmark and lower the settings.
Anyway, hope this helps, and good luck
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