Summary: I put this in with the new CPU heat sink and it makes a big difference in the operation of the computer and they are quiet. This does come with the adaptor connector so you can plug it into the power supply if you don't have enough connectors on your mother board.
Summary: There is normal fan noise caused by moving air and then there is bearing noise caused by poor design or material. The 2000 rpm fans have bearing problems that cause a irritating high pitched whine. This is causing problems for my customers. Go with a lower rpm fan for less problems.
Summary: I have a Thermaltake V3, and an Asus Sabertooth motherboard with a coolermaster evo cpu cooler. The fans won't fit anywhere, but up front, but the power cable isn't long enough to plug into the motherboard.
Summary: I have this fan installed on the front of my NZXT Phantom 410 case and, combined with the other four Cooler Master fans I have installed, does a great job of helping keeping my system cool. No problems with fan noise at any speed.
Summary: After the installation of this fan, right off the bat the total noise of my system went up significantly. A huge warning: This thing is really loud at max RPMs! After toggling it with SpeedFan the difference is really astounding.