Anyone ever try these optional fans for the northbridge and southbridge radiators used on the P5N32 series of boards? They are meant for watercooled setups but I was thinking of using one on my Southbridge radiator which is "north" of the CPU socket. Due to the fact that my CPU fan is a heatpipe tower style which only blows air front to back so the SB radiator is a little neglected. Anyone use them? How noisey are they?