When building a brand new computer choosing the right components is directly tied to the type of use ment for it so obviously you wouldn't use the same ones you'd use with the office system as you would with the one in your living room. Needless to say the same applies for the CPU cooler since a gaming oriented system would need one with a much higher cooling efficiency compared to that of an office system or even a HTPC. The downside however with really powerful CPU coolers is their massive size so if you wanted to place one inside a mITX/mATX case chances are you'd be out of luck. Well manufacturers know this all too well so for the past 2-3 years many of them have focused a lot in the design of compact CPU coolers with impressive cooling potential (for their size always). Noctua has already released several such models in the market but with their latest NH-D9L D-Type Tower Cooler they seem to be taking things one step further.