ok, had a look on my fan, which isnt even its pretty gravelly.
thats why i did not clean up the plate that much.
i put up the termal paste and booted. my system goes up to 46°C which seems ok to me.
the best part is... its a cooler for a 3000+ but its a 1700+ underneath so i was able to exchange the fan on the cooler from one that has 2800rpm with one with 2400rpm! now the loudest thing in the computer is the HARDDISK
NOTE: its a angular homemade cubic server case! made of acrylic glass! even the psu is open

- if anyone is interested i can post pictures (30x30x30cm)