Case fan came with molex connector, but it works without it ? Tags: Homebuilt Cases Fan Motherboards Systems Last response: January 9, 2012 7:19 AM in Systems Share fuggles January 8, 2012 9:58:30 PM i bought a case fan it works if I plug it straight in the motherboard but it also came with a molex connector, it also works if I plug it in the motherboard through the molex conectro it came with what is the difference Or is this cable it came with meant to allow me to attach another fan ? More about : case fan molex connector works Raiddinn a c 78 B Homebuilt system a b V Motherboard January 8, 2012 10:03:16 PM Motherboards have a varying number of fan connections. Some have one chassis fan and some have 3 or more chassis fan ports. The MOLEX connectors are for the PCs with less chassis fan ports than chassis fans, so they can still use the fans somehow. fuggles January 8, 2012 11:06:10 PM oh right what I have done is plug the fan straight into the motherboard this won't make any difference in performance than when it was connected to the motherboard via the molex ? Related resources Case fans not working when molex cable connected to mobo - Forum Molex connector question - Forum Adding more molex connectors for fans, puzzled! - Forum Case fans into molex connectors from PSU? - Forum Simple question about case fans being connected via molex & noise - Forum Can't find your answer ? Ask ! Get the answer phyco126 a b B Homebuilt system January 8, 2012 11:17:50 PM No difference in performance. danny2000 a b V Motherboard January 8, 2012 11:51:01 PM It is better to have the fans plugged into the motherboard pins because the motherboard will be able to read the sensor and fan speed and temp, etc. When you use the molex connector, the motherboard won't see the fan. Raiddinn a c 78 B Homebuilt system a b V Motherboard January 9, 2012 4:44:20 AM Somebody please correct me if I am wrong on this but afaik the motherboard can only read/modulate fan speed from a 4 pin port and usually the only 4 pin port is CPU_FAN. CHA_FAN chassis fan ports, in my experience, are usually 3 pin ports which means no fan speed modulation on these and no difference between these and a MOLEX. danny2000 a b V Motherboard January 9, 2012 7:19:06 AM I believe that you are correct on the 3-pin connectors Raiddinn. But many of the newer case fans are 4 pin and have sensors. Here is one that i found quickly....http://www.google.com/products/catalog?hl=en&q=4+pin+fa... Can't find your answer ? Ask ! Publish Related resources Case fan has 2 connectors mobo only has 3 pin connector Forum Connecting antec 1200 fans when PSU doesn't have a molex cable Forum Molex to PCIe power connector Forum Multiple fans and only one case fan connector . Forum HELP! smoke came out of my 4-pin fan header Forum Molex fan issue Forum I converted my Antec 900 fans from Molex to 3-pin Forum 1 molex to 1 6 pin Forum How to get the most combined power with two molex connections? Forum PCI compatibility question Forum Issues with New Build Forum Need help with building first comp Forum Help Choosing Case, GPU, & PSU for <$350 Forum Case Fan won't fit. Forum Which motherboard out of these? z68 - 115 with i5 Forum More resources Read discussions in other Systems categories Homebuilt New Build Prebuilt Cases Power Supplies RAM CyberPower !