I have a mini r80 also it make a little noise from the pump , but the noise are gone since a week , all depand the way you fix the radiator ....
me i have a p4 530 (3giga) it was at 45 degree with a other cooler (BEAR) X2 fan ,super noisy ,like an elicopter flying around your head 65 degree load ,and wen i overclock to 3.1 gg the computeur freeze and reboot .
the mini R80 are pretty incredible 28 degree , and i can overclock to 3.4 giga and it get only at 31degree , full load it get at 45 no more .
ATTENTION : wen you fix a mini r80 ...the mini r80 come with a iron plat thats you have to put under the mobo , is an iron plat with plastic ,the plastic side touch the mobo so no contact with the capacitor ...but ACTUALY IT TOUCH THE CAPACITOR , the capacitor solder are very speaky so they may touch the iron plat and make an short circuit .
i have an GA-81945p and the under of the mobo are super speaky so i get the short circuit stuff ..i burn a ddr2 256 like this !
so please all mate around would like to fix thats wonderful cooler ...CAREFUL THE CAPACITOR ON AND THE SOLDER UNDER THE MOBO ...
ps:sorry if i dont have the right english vocabulary