Have the same 5, plus the Northbridge 486-style fan plus the 2 in the P/S on my Athlon - but the unit is almost silent! Some work, and I occasionally have to service the 486 fan, otherwise ... bliss. Now if I could just silence the whirring of my laptop's HDD - it's the loudest thing in the office ;-) The trick was switching to the Antec P/S with integrated temperature related fan speed regulation - including the case fans. Plus substituting a big slow 80mm case fan for the CPU fan! CPU and motherboard temps went down 1F too :-)