Vortez have been testing out the Noctua NF-A12x25 fan, and here's a snippet from their review:\n\n[QUOTE]The FN-A12x25 uses an ultra-tight tip clearance on the edge of the blades, running only 0.5mm from the inside of the frame, requiring new engineering techniques to be employed. This helps to reduce back pressure by allowing the air nowhere to go other than forwards, affording a more efficient fan. There’s also flow acceleration channels, a solid steel and brass hub structure, stepped inlet design and loads of other technologies employed to ensure this fan is as good as currently possible.\n\nThe 120mm fan operates between 450RPM and 2000RPM via 3 different connectors, depending on the model you choose, with a supposed maximum noise of 22.6 dB (A) @ 2000RPM. The three models available are the PWM (Pulse Width Modulation), FLX (with 3 different hard-wired speed options) and ULN (An ultra low noise adaptor is included when acoustics are the priority).\n\nThere’s no questioning whether or not Noctua have presented to us a fan with significant investment so let’s find out how it performs in our tests.[/QUOTE]\n\n[ATTACH=full]2414[/ATTACH] \n\nRead more [URL='https://www.vortez.net/articles_pages/noctua_nf_a12x25_fan_review,1.html']here[/URL].