Have you read over any of the OC guides on this site, or any 5820k reviews regarding OC? If your new to overclocking, it's a good idea to read over some of this before "jumping in" without knowing what your adjusting. Since your going to try for 4.5, you don't need to move the CPU voltage jumper in the first place. There are several ways to adjust the voltage, but it depends on quite a few factors. There are modes for Adaptive, Offset, and manual voltage. There are also CPU "straps" that get adjusting when using the XMP profiles. If you enable the XMP profile, it will adjust CPU multiplers and voltages automatically, but it should keep your CPU speed pretty much the same. For your question regarding OCing without manually upping the voltage, it depends on other settings whether this works. Are you planning on setting a manual voltage yourself or AUTO selection by the motherboard? Before attempting though, what are your PC specs, including PSU, RAM, and CPU cooling? Lastly, regarding LN2, it's Liquid Nitrogen.