scubaslim :
I just ordered a new case. It comes with 4 case fans that have molex connections. My mobo only has two 3-pin connections. I plan on getting a couple molex to 3-pin adapters. My question is can I piggyback the molex together so the mobo is controlling all of the fans?
Most of motherboard fan header can output about 1A, so depends on the fan, but I recommend don't use over 2 fans on a single fan header, so check the fan label, like the link
http://www.endpcnoise.com/e/images/papst_silent_case_fan.jpg that one has 0.37A so you can use only 2 of them. If you overload the header, you know what happens.
If you can't connect all the fans into MB, you either buy the fan controller or using the 4 pin molex connect to the PSU, if your fan look like this
http://i00.i.aliimg.com/img/pb/252/689/743/743689252_598.jpg Or buy the adapter to connect to the PSU
http://www.conrad.com/medias/global/ce/9000_9999/9700/9760/9762/976285_BB_00_FB.EPS_1000.jpg