4-pin case fan and only 3-pin motherboard connector? Tags: Power Supplies Cases Fan Motherboards Components Last response: July 12, 2010 8:45 PM in Components Share ricno July 12, 2010 6:36:08 PM I have bought two new case fans and am now trying to install them into my case. The fans have a 4-pin connector to motherboard, and I thought I know that my motherboard has two of these. However I have now realized that the board (ASUS P7P55D-E LX) has only one 4-pin and one 3-pin case-fan connector. From the manual they seems to have different purposes: The first one has these explanations for the pins: GND, CHA FAN PWR, CHA FAN IN and +5v. The other one has these: GND, +12v and Rotation. Is it possible at all to install the second fan on to this motherboard? More about : pin case fan pin motherboard connector | E-mail me updates | Report abuse Register or log in to remove Henry Chinaski Power supply Master Motherboard Expert July 12, 2010 7:03:15 PM You can install the 4-pin fan in the 3-pin mobo connector without any problem. When using a 3-pin power connector with a 4-pin fan header, the fan will always be on. There is no fan control. But It will work fine. | Report abuse ricno July 12, 2010 7:29:16 PM Thank you for your reply. So it will just be to attach it the only way it fits? It does not matter that the pins according to the motherboard has different purposes? | Report abuse Henry Chinaski Power supply Master Motherboard Expert July 12, 2010 8:01:44 PM It doesn't matter at all. | Report abuse ricno July 12, 2010 8:45:40 PM Thank you, it worked out fine. | Report abuse Register or log in to remove Ask the community Publish Tom's Hardware>Forum>Components>4-pin case fan and only 3-pin motherboard connector?> Related ressources: ForumOnly one 4-pin fan connector on mobo and two 3-pin case fans? Forum3-pin CPU Fan and only 4-pin CPU Fan connecter.. HELP! ForumCase Fans- 4pin , 3pin , molex ForumCan i connect a 3pin fan connector to my mobos 4pin fan provision ForumConnecting case fan to 3-pin CPU fan connector ForumCorsair H80 Has 3Pin Fan & my MB has 4Pin Fan ForumMy motherboard has 4-pin , but case fan is 3-pin ? ForumProblem - 3-pin Mobo Header, but 4-pin Fan Power (not molex) Forum4pin case fan to 3pin controller Forum3-pin and 4-pin fan connectors ForumFan Controllers - Only 3-pin not 4-pin (Molex) ? ForumDifference between 3pin and 4pin fan connectors? ForumDefective 3pin plug in FAN connector on mobo Forum3-pin fan vs. 4-pin fan ForumConnecting 3-pin CPU fan to 4-pin motherboard Forum212 evo fan replacement ForumPower Supply & Case For 8 HDDs FreeNAS Server ForumPlease help choosing motherboard Forum[Solved] HAF 932 case with LED lights? ForumI need help choosing a case More resources Read discussions in other Components categories Power supplies Sound cards NICs Akasa Antec Cooler Master Cougar DeepCool Enermax !