. H45 SELF-CONTAINED COOLING SYSTEMYour PC will run cooler & quieter when you replace your CPUs standard heatsink with a Hydro Series H45. Installation is straightforward if you can get to the back of your PCs motherboard you can install an H45. All youll need is a screwdriver. The compact components & flexible tubing make Hydro Series H45 easy to install even if youre cramped for space. It means that you can improve your CPUs cooling efficiency even in most compact cases — as long as your case has a 120mm fan mount near the CPU the H45 will probably fit..