Mine does not have a molex connector - make sure that yuo aren't seeing an optional converter that comes with the fan, I'm not sure, but I think mine came with a 3 to 4 pin converter for people who want to use them as case fans.
For some reason, the speed controller doesn't seem to be working on mine - thankfully the A7N8X has a built in speed controller on it, as these things get really loud at full blast.