As some may recall, I'm building myself an htpc . The case comes with 4 80mm fans. Two are 80x15mm mounted horizontally under the hard drives. the other two are 80x25mm mounted vertically on the back. I have been running it with the top off and only one of the 15mm fans running, it was pretty quiet. Today I got an adaptor to hook up all 4 fans and when I turned the machine on I thought the thing was gonna take flight. \:o This has confirmed the need for a silent fan solution of some kind. the rear fans are loudest by far, but the slim fans are moving very little air. Can any of you pc experts guide me towards a nice, quiet, reliable fan? I'm willing to pay for quality here.