GTX 560 Non TI 50-60 degrees celsious on idle

Guys i need help, i have , i dont know if i should say a problem but its pissing me off. So basicly, i went to nvidia control panel, someone told me to check options there. Anyway, WITH adaptive option i get 30-40 idle but i get 80-90 when playing something intensive (like bf3). If i turn adaptive OFF i get 55-60 idle but i get 75max when playing intensive games like bf3. What the hell?

Should i worry or not? I made a mistake and i got a very bad case, 8mm fans only , i managed to fit a 9mm one there dont ask how and i added another 8mm on the back to blow out, it helped lower the tems by at least 10degrees... I am aware that with my rig i should have at least a 120mm ones blowing inside and another one blowing outside but is there a way to lower temps without this paying for a new case since 50 euros is kind of a 1/4 salary in my country ? I cleaned the dust too so its not that.

rig:
i5 2500k 3.3
4gb ram ddr3
gtx560 non ti
mobo : asus p67 mb pro

PLEASE ASNWER!