Basically if you plan to do anything with your chip which is gonna make it hot, then you need to think about getting a higher CFM fan.
It also depends on how hot the room is...if the room is generally warm and stuffy, and your computer blows lots of hot air around, and your case cooling generally is poor, then the Zalaman *may* not cool enough.
Like ToledoSteel said, it depends which Proccy youve got. Some are hotter (like palominos), whilst the ThouroughBred B's tent to be cooler.