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#11
If you dig deeply into your motherboard specs, you may find out how many amps are available at the fan headers. It will vary from motherboard to motherboard as far as I know.
Each fan you buy will have an amp rating. I bought two 120 mm fans recently. One was rated at .3 amps. The other at .1 amp. So both on the same header would draw .4 amps. I am running both off Molex and did not look up how many amps I could run off the fan headers---but I'm sure it was more than .4 amps, so I would have been OK. I chose Molex because I had Molex connectors.