They do get pretty warm, but cooling doesn't really affect them. However it gets the heat moving to where the cool air flow from your case fans can exhaust it more efficiently. You do have case exhaust fans, do you not? If not, forget the drive coolers and get some. A decent pair of fans, one for intake from the lower front, and one for exhaust at top rear can make a big difference in your cpu temps- 10-15 degrees! I improved 5 degrees (cpu temp) by changing to higher speed fans without any other changes.