Not both. The small one plugs into the mobo. You must look in the manual ot at the mobo to see if there is an available place to plug it in. That type provides control of the rpm of the fan depending on need for cooling. You can look for them on your mobo, they are 3 male pins sticking up from a plastic base, that accepts the female pins from the small connetor. The mobo should have the word "x" fan by it, where X can be anything, such as "system"
Why not simply get the one with the four pin molex and connect it to one available from the power supply, and let the fan always run at full speed?? None available, get a Y cable to get another socket to use.
80MM is usually the standard size for case fan mounting places.
I want to fit an 80mm fan to the back of my computer case, though I'm not 100% sure where/how the power adapter fits?
A lot of the ones I've seen come with a 4-pin power connector and a separate signal connector to the motherboard, but the problem is I don't know if I have the right 'sockets' on my motherboard.
Any help would be greatly appreciated...
I can take pics of my motherboard if that helps