Conclusion: What I really like about the Noctua NH-U9B SE2 is the compact size. It fits snuggly on our Gigabyte P55 USB3 motheboard without any problems, even with both of the fans installed. And needless to say, the other big plus is the silence. When you connect up the 2 LNA cables to the two fans, it goes into an ultra-quiet mode with the fans spinning around 1,000 rpm or less. To make it even quieter, just install one fan instead of two.