i7-5820k Overclock

So I just bought a new build and am trying my hand at overclocking.

• Current multiplier: 45 (4.5GHz)
• Current Voltage: 1.3v
• Current Ram Speed: 2400MHz
• Current Idle Temp: 26C
• Current Full Load Temp: 53C
• Full build: http://pcpartpicker.com/p/rMyLhM

Successfully run IntelBurn test 100 times in row no crash. However it did seem like 4.5 was the highest I was going to get with 1.3v. So the question is, do I push on? What would be the best way to do so, more voltage?