Comparing to a stock box cooling solution may seem less than ideal, but Corsair`s H90 does well against more capable cooling solutions. When overclocked it delivered a three degree improvement over one of the best air cooling solution out right now from Phanteks. Any which way you look at it, the performance speaks for itself. Chassis compatibility runs the gamut, but suffice to say the H90 is going to require a chassis that accommodate a 140mm fan in either the exhaust or input fan locations. If you are adventurous you can even mod your chassis to fit one in."