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Wondering if anyone has found the specifications of the resistors in the Noctua LNA or ULNA adapters, as I am contemplating throwing one in to wrangle my EFB0912HHE that's running exhausting my computer at 4000rpm.<br><br>
I know people have stacked a few fans on one adapter before, used higher amp fans, etc...but this fan is rated at .64 amps....and I don't really feel like having a bbq with my computer, or having a resistor puke itself or grenade on me.
 

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Black LNA: <b>50 Ω</b><br><br>
Blue ULNA: <b>81 Ω</b><br><br><div class="bbcode_center" style="text-align:center;"><img alt="nh_u12p_lna_ulna.gif" class="bbcode_img" src="http://www.noctua.at/images/faqs/nh_u12p_lna_ulna.gif"><br><br><a class="bbcode_url" href="http://www.silentpcreview.com/article1020-page5.html" target="_blank">http://www.silentpcreview.com/article1020-page5.html</a></div>
<br><br>
Judging from size I'd say wattage is 0.5~1 W .
 

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<p>Why not write to Noctua and ask about their current resistors? They have several kinds, as you can see in <span style="text-decoration:underline;"><a href="http://www.vortez.net/articles_pages/noctua_a_series_fans,1.html" target="_blank">this review</a>.</span> And even then, there are LNA/ULNA resistors I did not see because I don't have those fans (e.g. -- 40mm, 60mm, etc.). I have a 92mm fan on the NH-L12. It has yet another resistor.</p>
<p> </p>
<p>Maybe Noctua will tell you the Ohm numbers.</p>
 

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I've got a dozen or so resistors from NF-B9, NF-P12 & NF-P14s. Measuring with multimeter all blacks are ~50 Ω, all blues are ~81 Ω.<br><br>
May be the newer (A14, A15) Noctua models come with different value resistors. It's dead easy to find, anybody with one of these fans can read the resistor with a multimeter.<br><br><br><br>
BTW to help tweaking fan speeds with resistors & voltages there is this handy online <a class="bbcode_url" href="http://www.blackfiveservices.co.uk/fanspeedcalc.php" target="_blank"><span style="color:#008B00;"><span style="text-decoration:underline;"><b><span style="font-size:16px;">Fan Speed Calculator</span></b></span></span></a>.<br><br>
.
 

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Unlike other Noctuas the NF-F12 PWM comes with only a resistor wire, labelled "LNA NA-RC6".<br><br><div class="bbcode_center" style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1552122/"><img alt="" class="lightbox-enabled" data-id="1552122" data-type="61" src="http://www.overclock.net/content/type/61/id/1552122/width/820/height/323/flags/LL" style="; width: 820px; height: 323px"></a></div>
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I've measured it at <b>81.4 Ω</b>. So it's functionally identical to the classic blue ULNA.<br><br><br><br>
If and when I lay hands on other models of Noctua fans I'll post more resistor readings here.
 
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The NF-S12A FLX comes with two resistors:<br><br><div class="bbcode_center" style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1612366/"><img alt="" class="lightbox-enabled" data-id="1612366" data-type="61" src="http://www.overclock.net/content/type/61/id/1612366/width/802/height/1000/flags/LL" style="; width: 802px; height: 346px"></a></div>
<br><div class="bbcode_center" style="text-align:center;">LNA 'NA-RC10' = <b>51</b>Ω<br>
ULNA 'NA-RC12 = <b>147.5</b>Ω</div>
 
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+REP for that. Good info to have. <img alt="thumb.gif" class="bbcode_smiley" src="http://files.overclock.net/images/smilies/thumb.gif">
 
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