Its a very good cooler for 12 Euro, it can be completly passiv up to 2.6GHz with the I5.thank you. i use their stuff before. good stuff
And with stock settings (all core 3.5 & one 3.7 GHz) u need only 1 case fan @ 900rpm.
My new System:
1 in, 1 out case fan @ 900rpm ill post a picture in 2 days