I have 2 80mm fans in my case, one pulling air in at the front, one pushing it out at the back. How much of a difference to my motherboard temp (36C currently) will replacing them with 120mm fans make. I'm just wondering whether its worth spending my money on them considering as i'm short on money right now. thanks.
Depends what kind of fans, and if you really want to spend the money. Silverstone 120mm i hear are really good air movers. Their roughly 13-15 bucks each, but would make your case cooler. Looks fine right now though. If you got the cash to spend, go for it.