magnethead

Well, I couldn't afford all 12 LEDs.

But i'm making it work with 3 blue and 3 white. I need to get a 220 ohm resistor though (5 pack- 99 cents). So far, got 3 wired up.

Each LED will get 4 volts before resisted, so something like 3.8 or 3.7 volts resisted..which is pretty close to typical voltage (each is rated 4V max, 3.7 typ).

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For proper support: what are you running? video card, cpu, m/board, ram, power supply, brand, wattage, any error message?
PCI-E requires 26 amps at 12 volts. That's a 650W PSU.
Power Supply Info and Selection . Info on thermal compounds & application . TEST PSU USING MULTI-METER