1. motherboard temp gagues can be off by like 10 deg in some extreme cases
2. its a little hot but i wouldnt worry strt worryin wen it gets in the 80' as thats gettin near most cpu melting point
3. if ur comcerneed add some case fans. in this way
cool (outside air) is injected at the bottom anhot air extracted at the top
add these to the side or back pannels (logic says it works as hot air rises an this is wat u want to get rid of)
i have this an i run my AMD at around 30-40 deg even wen maxing out


ps fans r like 50p an u can daisy chain them

good luck