Voltage per Molex

[zenius]

I have a Seasonic S-12 600W and currently I use the 6 molex connectors to power 4 120mm fans and my dvd drive. I don't know if it is just me or not, but some of my fans don't seem to be pushing as much air as they used to. I was wondering since there are 3 molex on each of the two "wires" if my fans should be getting 12V each. My fans could be old but I just wanted to clarify how voltage is distributed among the connections on a psu

 

[JonGerow]

They should be all the same voltage down the line... heck.... even across different leads even if they're on separate rails. All +12V is regulated from the same source, so if the voltage is different it's because of resistance... but that's going to take A LOT of resistance, like a pin crimped on so piss-poorly that it's about to fall off.