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Thermaltake Riing 12 using Molex and LNC cable

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Jul 30, 2019
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System Name Still not a thread ripper but pretty good.
Processor Ryzen 9 7950x, Thermal Grizzly AM5 Offset Mounting Kit, Thermal Grizzly Extreme Paste
Motherboard ASRock B650 LiveMixer (BIOS/UEFI version P3.08, AGESA 1.2.0.2)
Cooling EK-Quantum Velocity, EK-Quantum Reflection PC-O11, D5 PWM, EK-CoolStream PE 360, XSPC TX360
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Case Lian Li PC-O11 Dynamic Black (original model)
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Benchmark Scores RIP Ryzen 9 5950x, ASRock X570 Taichi (v1.06), 128GB Micron DDR4-3200 ECC UDIMM (18ASF4G72AZ-3G2F1)
Unfortunately on a new build for a Christmas present I ran out of fan headers on my motherboard and I don't have a fan hub or controller available at the moment.

Thermaltake Riing 12 fans (3-pin fans) come with a molex to 3-pin power connector but no clear instructions (in the box or online) if the included LNC cable is only supposed to be used with a motherboard header or if they can be safely combined with using the molex to 3-pin power connector. Obviously running the fans off the molex they run 100% which is terrible for noise so without a fan controller at the moment I was going to use the LNC cables temporarily until my controller arrives.

The fans are rated 12v 2.4w 3-pin 1500 rpm or 1000 rpm with LNC cable. Physically the LNC cable will plug to the fan cable 3-pin connector on one side and to the 3-pin connector on the molex cable on the other side.
In my configuration each fan is receiving power from it's own molex connector and each fan has it's own LNC cable.

So without much thought at the time I plugged them in. Powered up it seems to work in that the LNC cable appears to do what it's supposed to do so fan RPM is much lower and thusly quieter, but I got concerned because the cable gets quite hot, very specifically hot where the resistor must be located under the sheathing not long after powering on. I usually don't use LNC cables (in fact this is my first time using any) so I'm not sure how hot they are expected to get, or if there may be a particular difference to how hot they get when connected to a motherboard header vs. molex power, or perhaps I made a mistake in that I should have been using the LNC cable with molex power.

Is this typical with 3-pin fan LNC cables?
Did I get worried over nothing?

I wanted to better control the speed anyway so I'm waiting for a simple manual controller to arrive.
 
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