yea it is 60 i'm sure, make sure you get a good brand, all the little ones are basically the same
*edit* ohh wait, first you've got a 64b which iono what size the fan is, pull out a ruler and check if ya have to. The noise isn't necessarily coming from the hsf though.. I mean, you have a 6800 in there.. what do you think is causing the noise? a dinky little fan or the fan on the 6800?