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Noctua LNA resistor ratings?

post #1 of 7
Thread Starter 
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.

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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Stonebox
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post #2 of 7
Black LNA: 50 Ω

Blue ULNA: 81 Ω



Judging from size I'd say wattage is 0.5~1 W .
Edited by TELVM - 7/7/13 at 4:13am
HAL-9011
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post #3 of 7

Why not write to Noctua and ask about their current resistors? They have several kinds, as you can see in this review. 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.

 

Maybe Noctua will tell you the Ohm numbers.

alpha updated
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secundus
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alpha updated
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secundus
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post #4 of 7
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.

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.



BTW to help tweaking fan speeds with resistors & voltages there is this handy online Fan Speed Calculator.

.
Edited by TELVM - 7/7/13 at 10:07am
HAL-9011
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HAL-9011
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post #5 of 7
Unlike other Noctuas the NF-F12 PWM comes with only a resistor wire, labelled "LNA NA-RC6".



I've measured it at 81.4 Ω. So it's functionally identical to the classic blue ULNA.



If and when I lay hands on other models of Noctua fans I'll post more resistor readings here.
HAL-9011
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OCZ Vertex 4 128GB OCZ Vertex 2 120GB WD Caviar Black 1TB LG DVD-RW 
CoolingCoolingOSOS
Noctua NH-D14 Accelero S1 R.2 + 2x NF-F12 Se7en x64 Se7en x32 
PowerCase
Antec TP-650W CM HAF 912 + 
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HAL-9011
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CPUMotherboardGraphicsRAM
Phenom II 960T X6 4.1GHz ASUS M4A89GTD Pro Radeon HD 6870 16 GB DDR3 1600MHz 8·8·8·24 
Hard DriveHard DriveHard DriveOptical Drive
OCZ Vertex 4 128GB OCZ Vertex 2 120GB WD Caviar Black 1TB LG DVD-RW 
CoolingCoolingOSOS
Noctua NH-D14 Accelero S1 R.2 + 2x NF-F12 Se7en x64 Se7en x32 
PowerCase
Antec TP-650W CM HAF 912 + 
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post #6 of 7
The NF-S12A FLX comes with two resistors:


LNA 'NA-RC10' = 51Ω
ULNA 'NA-RC12 = 147.5Ω
HAL-9011
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Phenom II 960T X6 4.1GHz ASUS M4A89GTD Pro Radeon HD 6870 16 GB DDR3 1600MHz 8·8·8·24 
Hard DriveHard DriveHard DriveOptical Drive
OCZ Vertex 4 128GB OCZ Vertex 2 120GB WD Caviar Black 1TB LG DVD-RW 
CoolingCoolingOSOS
Noctua NH-D14 Accelero S1 R.2 + 2x NF-F12 Se7en x64 Se7en x32 
PowerCase
Antec TP-650W CM HAF 912 + 
  hide details  
Reply
HAL-9011
(14 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II 960T X6 4.1GHz ASUS M4A89GTD Pro Radeon HD 6870 16 GB DDR3 1600MHz 8·8·8·24 
Hard DriveHard DriveHard DriveOptical Drive
OCZ Vertex 4 128GB OCZ Vertex 2 120GB WD Caviar Black 1TB LG DVD-RW 
CoolingCoolingOSOS
Noctua NH-D14 Accelero S1 R.2 + 2x NF-F12 Se7en x64 Se7en x32 
PowerCase
Antec TP-650W CM HAF 912 + 
  hide details  
Reply
post #7 of 7
+REP for that. Good info to have. thumb.gif
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