noctuas low noises

===> LOW NOISE ADAPTERS :

Classic Black LNA 50Ω (source)
Classic Blue ULNA 81Ω (source)
http://www.silentpcreview.com/article1020-page5.html

RC7 LNA 51 Ohm (when there was black or blue, it was black) Drops 12V to about 8.5 V
RC6 ULNA 81 Ohm (when there was black or blue, it was blue) Drops 12V to about 7.3 V

NA-RC6  -  80 Ohm (4 pin)
NA-RC7  -  50 Ohm (4 pin)
NA-RC8  - 150 Ohm (4 pin)
NA-RC9  - 100 Ohm (4 pin)
NA-RC10 -  50 Ohm (3 pin)
NA-RC11 - 100 Ohm (3 pin)
NA-RC12 - 150 Ohm (3 pin)
NA-RC13 -  80 Ohm (3 pin)
NA-RC14 -  25 Ohm (4 pin)
NA-RC15 -  25 Ohm (3 pin)