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Noctura speed reducer running hot

post #1 of 4
Thread Starter 
Hey guys so I had some spare speed reducers from noctura. There just connectors with resistors in them. Well it seems they run really hot? like ouch hot. Is this ok? I don't want a fire in my pc. I'm using CM 120mm fans to reduce the noise. Had some spare fans laying around and wanted to cool my gpu down for bf3.
post #2 of 4
Thread Starter 
anyone?
post #3 of 4
Quote:
Originally Posted by TG_bigboss View Post
Hey guys so I had some spare speed reducers from noctura. There just connectors with resistors in them. Well it seems they run really hot? like ouch hot. Is this ok? I don't want a fire in my pc. I'm using CM 120mm fans to reduce the noise. Had some spare fans laying around and wanted to cool my gpu down for bf3.
Let me suppose you have a Noctua NF-P12 fan which is rated at 0.09A at 12V. Its two speed reducers are designed for this spec.

If such a reducer is used with a higher rating fan (eg Cooler Master Blade Master 120mm with 0.36A at 12V), then a higher (ie >0.09A) current will go through the resistor, causing higher heat.

I suppose, if the current is high enough, it will just melt the resistor and the wrapping plastic.
post #4 of 4
Quote:
Originally Posted by windfire View Post
Let me suppose you have a Noctua NF-P12 fan which is rated at 0.09A at 12V. Its two speed reducers are designed for this spec.

If such a reducer is used with a higher rating fan (eg Cooler Master Blade Master 120mm with 0.36A at 12V), then a higher (ie >0.09A) current will go through the resistor, causing higher heat.

I suppose, if the current is high enough, it will just melt the resistor and the wrapping plastic.
I have observed exactly this when checking out fans and speed reducers. The 7v reducer for the Zalman ZF3, for example, is a much larger resistor than that for an Aerocool Shark - because the Zalman fan draws more current. Run a fan that draws too much current on a resistor wire not designed for it and you get hot hot hot.

BTW - don't get too impatient, OP. You only let two hours go by before you posted "Anyone?" Many members only visit once a day.
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alpha updated
(19 items)
 
secundus
(14 items)
 
 
CPUMotherboardGraphicsRAM
i7 4790k Gigabyte GA-Z97X Gaming-7 Intel HD4600 Crucial Ballistix Sport Very Low Profile 8GB Ki... 
Hard DriveCoolingOSMonitor
Samsung 840 EVO 500GB Prolimatech Megahalems Rev. C Windows 8.1 Home Premium 64-bit Acer K242HL 
KeyboardPowerCaseMouse
Dell SK-8110 (PS/2) Seasonic X460 Fanless motherboard tray from CM ATCS 840 Logitech MX 1100 
Mouse PadAudio
Dell Creative SoundBlaster X-Fi MB3 
CPUMotherboardGraphicsRAM
i7 860 Gigabyte GA P55M UD2 ZOTAC/NVidia GTX 650 Ti 2GB 4x4GB G.Skill Ripjaws DDR3-1333 CAS9 
Hard DriveOptical DriveCoolingOS
Samsung 1TB Spinpoint F3 7200.12 Plextor 24x DVD burner Cooler Master Hyper Z600R Win7 64-bit 
MonitorKeyboardPowerCase
Dell E207WFP 20-inch flat panel Logitech Wireless 510 Seasonic X-650 fully modular 80+ Gold Lian Li PC-7FN 
MouseMouse PadAudio
Wireless Mouse WACOM Intuos 3 generic 
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