Blowing air in over the CPU HSF is a good idea to cool it further but you may cause other components to not have air flow over them.As back in the day, best to suck air in front and out back. I have a double fan PSU sucking directly over the CPU fan that wisks away the hot air. Same thing goes for the rear fan, it sucks out. If it is not set up this way the air will come in the back and flow out the back in a cycle that just moves warm air over the CPU and MOBO. The HDD's and other items in the front do not have air pulled over them and get hotter.


I have low flow fans coming into the PC in the front to move air over HDD's to cool them. This is known to increase their life expectancy. I also use multiple blowholes. One on the side blowing in at the vid card/CPU and one on top venting out.

I use vantec stealth fans or cheapo 80mm fans I have placed a resistor on to limit the RPM to 1200-1500. This makes the 4 fans I have all very, very quiet and a Thermaltake silent PSU is great too. Some Dynamat sucks up the HDD niose and the loudest thing on the machine is the P4 cooling fan.