I had just replaced the cooling fan in my fat 80 Gig bc ps3 because it kept over heating and would get really loud and shut down on me. I used a 19 blade TailsMoon Whisper fan and replaced the thermal paste and it runs really cool now. But i found that the new fan would rub on the heat sink making a really loud grinding noise so I had to add some small washers between the fan and the heat sink which seems to have stoped the grinding. I do find the fan to be loud though I have the ps3 laying down in a very open space it doesn't seem to kick into the high gear like it did before(which was really loud like a jet taking off). I do still find it louder then the 360 and the ps3 slim and i'm not really sure why does anyone have any ideas.