would this be effective?

[nick_lerwill]

ok i have a pc-7+ with 1x120mm at the front and 1x120mm at the back but how would changing the 80mm fan at the top to a 120mm. also if i was to put a 120mm fan at the bottom of the case below the pci cards

how would this help the cooling? is it worth doing?

 

[nick_lerwill]

but would it make a big difference to the case temps?