I have chosen to get a core i5 4670k. If it is relevant, I'll have you know that I have a Gigabyte Z87-UD5H board. I am using 1866 Mhz PATRIOT Viper3 Series 8GB Desktop Memory. I am using a Thermaltake CLP0596 Frio Advanced Universal CPU Cooler as well. I was wondering what is the highest amount of Mhz I can get out of the cpu without it crashing on me.