I recently built a AMD 64 system useing an Antec SLK3700AMB case with an Antec 350w power supply in it. The first few weeks it was real quiet ( much more so than any other PC I ever owned ) but within the last few days the power supply fan has became really loud. I can place my hand over the PSU fan in the rear of the case and drown out almost all of the noise from the PC. I am not sure if its a problem with the PSU, or if its ramped up for some reason? I was thinking of buying a Seasonic super sliencer 400w to replace it, but if I can quiet it for free then I can use the $100.00 towards something else.