Yes you will need to add some voltage, but that will definitely cause extra heat. With that motherboard you should have a single page guide that shows safe voltage settings for air, covering CPU, Ram, and Ring Voltage - just use these as a guide (MSI Z87 Platform OC Setting Reference Table - hwbot.org) . I have now tested 10 cpus on air and under LN2 - if you have a CPU that boots into windows at 4800 you definitely have a good cpu (probably very good). The duds will bench 4.3 / 4.4 (luckily I have not had one this bad), most will bench 4.5 / 4.6 no problem (7 of 10 for me), a much smaller percentage will bench at 4.7 (3 out of 10 for me), I didn't see one in 10 that would do 4.8. I would start by setting CPU Volts manually at 1.25V and work up slowly from there. I was using 1.35V for my testing.
