Or whatever the four lead power deal is. I got the multimeter and checked and sure enough yellow is 12 and red is 5. What set me off on this high tech query is that in putting a fan on the heatsink of my ATX/G3 it has a red and black power lead to the fan itself, and a passthrough/ extension for the four lead (what I call Molex) and this color/voltage reversal confused me (the fan is clearly marked 12v).
One other point. A lot of fans will have a third lead that may be yellow, blue or brown. This one is the tachometer lead and can be ignored in most applications. Only if the PROM firmware or CMOS on a motherboard monitors fan speed is this lead necessary.
James
http://www.vzavenue.net/~jrice54/classiccomp2.html
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