comparison of 80 mm fan and 120 mm fan

[GeckoEcho421]

120s are quiter and move more air. if your case isnt built to support a 120mm fa its not hard to mod using a dremel

Correct.

 

[jaksback]

i have a 120mm on my cpu, outrageous but efficiant and keeps my cpu down to 34c all the time:

 

[Cappy]

hehe cool , The 120 mm are the way to go , The reason you see most cases with 80mm is there cheaper to make.A case with 120mm inlet outlet fans are usually 2 inches deeper .Ive noticed with my setup running the fans at the same RPM cools better .Im using the Antec P160 case .If i purchase another case down the road they will have 120 fans .

 

[Dell XPS]

if you're looking for a great 120mm fan that moves a ton of get this one. http://www.frozencpu.com/cgi-bin/frozencpu/fan-22.html
Since i have a dell, the stock intake fans were sh/*. so i replaced it with this one now my cpu idle is 38c vs 45c. also the fan can get loud so i would recomend getting a fan controler as well.