I recently built a computer with a Gigabyte GA965P-S3 mobo and an Intel Core 2 Duo E4300 and slightly overclocked it to 2.3 ghz. I decided to add a front case fan to see if that would get me a slight improvement in system temp and cpu temp. I benchmarked the system with the fan connected and without the fan connected. The better benchmark using SiSoft Sandra Lite was achieved by not connecting the front intake fan.In fact, the reading was 1 degree celsius better. I realize that all cases are not equal but the hot air theory does not seem to apply here. By the way; I do have another 120mm exhaust fan blowing the hot air out of the back. The power supply I use is a FSP 400 watt with the fan in the bottom of the supply. I need some other ideas on this one.