overclocking devils canyon

Hi, im new into the overclocking world and was just messing around with my CPU and digging through the forums and wanted to try out overclocking I have a i5 4690k with H60 for cooling and I was just wondering is 4.3GHz @1.205V a good overclock and why my cpu temperatures go up to 100 degrees...

I just want to know why my monitor is capped at 60 hz with the display port. it is a bexq xl2430t and with the dvi it supports 144hz. I'm confused!