I have a Swiftech Apogee XL2 that has an addressable LED inside it. I want to connect it to my other RGB setups but I need to know the pin signals and voltage of the LED. I have a multi-meter at the moment but I can buy anything else that's needed. What do I need to do? Can anybody help? I only have very basic electrical knowledge but I'm ready to learn. I've included photos of the block and the connector in the link below. Thanks!


Based on my research, I'm certain it's one of these two variations below. I'm just not sure about the voltage and how to identify the pin order.


  • \$\begingroup\$ 3 pins? It's obviously not the 4 pin version on the right, that's for non-addressible leds. \$\endgroup\$ – Passerby Oct 7 '18 at 23:22
  • \$\begingroup\$ Look closely at the pins on the connector. Use a magnifying glass if you must. Which one is it? 3 pins or 4? If 3, which seems likely, you cannot directly connect it to other direct RGB units. You would need a 5 volt serial data stream to set the intensities. But that is putting the cart before the horse. How many pins? \$\endgroup\$ – WhatRoughBeast Oct 7 '18 at 23:50
  • \$\begingroup\$ @WhatRoughBeast it's a 3 pin connector and the manufacturer calls their RGB "addressable" so I'm thinking it's more likely a 5V addressable RGB, Thanks for your input! Now I need to figure out the pin signals. \$\endgroup\$ – Ran Li Oct 8 '18 at 15:13

Some multimeters have a diode tester so you could use that on any number of LEDs to find their forward voltage. This may not work on adressable LEDs. Other than this you can try to identify the LEDs and Google them to find the spec sheets Fv at the least, but bear in mind that this is usually fairly inaccurate but it could be your only option.

You could also check the output of the PSU for the LEDs and go from there about a correct supply voltage.

If I needed to test the pinout I would:

  1. Try to find a schematic in the manual
  2. Tap each contact with a lesser supply voltage till you get lights
  3. Attempt to find the schematic and specs of the IC that is being used to make the LEDs adressable throughout the strip. This might also reveal the reccomended input as I would hope the ICs had a constant current driver (better running conditions for an LED than contant voltage).

Hopefully this is what your looking for!

  • \$\begingroup\$ It seems like this LED connects to a motherboard fan header. You can check the voltage of the fan headers in your motherboard manual or online I would guess. \$\endgroup\$ – Oleenick Oct 7 '18 at 23:30
  • \$\begingroup\$ Thanks for your reply! I know that it's either 5V or 12V. Would my multi meter have enough power to light up the LEDs, or is that not how a multi meter works? \$\endgroup\$ – Ran Li Oct 8 '18 at 23:18
  • \$\begingroup\$ Possibly not, but it would have enough power to run the LEDs at their Forward Voltage, which is the the voltage at which current flows through the LED. If this were me I would get a 5 or 12V supply and just tap the connectors with a 5V supply and see if they are bright enough. If not I'd suspect that they are 12V. \$\endgroup\$ – Oleenick Oct 10 '18 at 2:48

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