I installed a temp. monitor/case fan controller in an empty 5 1/4" bay in my case. Video card always runs hottest,even though it has onboard fan & I have a 80mm case fan blowing over it & cpu. Temps. for cpu,hdd,& vga max out @ 37C,w/about 3 degrees difference at most between all 3 units watching a dvd. Added top rear exhaust fan next to power supply in addition to side case fan. Chopped out metal grillwork in front of front case fan,front plastic case bezel hides that. More airflow,easier on fan,quieter. Mounted 2 1/2" plastic 90 degree pipe drain fttg. onto back of front fan so it blows onto HD,DVD burner,etc. Dropped HD temp. 5 degrees! I don't like the idea of fans in top cover, seems like dust,bugs,soda,etc. could gain easy entry.