Originally Posted by
looz
Liquid coolers are more expensive, louder and run only slightly cooler than best air coolers. They can also fail, while air coolers are rather foolproof. It frankly isn't a good buy unless your case is space restricted and can't fit a large air cooler.
While it is significantly slower than 4770k, I would skip upgrading the CPU. With some overclock almost all games will be GPU bottlenecked. Pretty much only MMOs including WoW will benefit from an upgrade, but even then 4770k isn't sensible. 4670k only lacks hyperthreading compared to 4770k.