Problem connecting fans

[JustinCE13]

I currently am building a computer it has a Asus p7p55d-e motherboard my issue is I don't know where all to plug in my fans pardon I'm still I newbie at building it's my first build

 

[alexoiu]

What fans?

 

[raisonjohn]

Your motherboard should have 4x total fan headers:
- A 4-pin CPU_FAN header (located near the battery/Asus logo of your motherboard)
- A 4-pin CHA_FAN1 header (located beside the CPU_FAN header)
- A 3-pin CHA_FAN2 header (located near the bottom right corner beside the green-colored SB_PWR (standby power) LED)
- A 3-pin PWR_FAN header (located at the top right corner beside the screw hole)

Among those 4x fan headers, only the 4-pin CPU_FAN header is a true PWM header (for 4-pin PWM fans) which provides constant voltage but variable current to change fan speed. The 4-pin CHA_FAN1 header is a DC header (ideally used for 3-pin DC fans or, at times, for 4-pin fans as well) which can provide variable voltage to change fan speed. The 3-pin CHA_FAN2 and 3-pin PWR_FAN headers are all full-speed headers (can be used for 3-pin or 4-pin fans) which provides constant voltage and no speed control.

As to which fans will be connected to which headers, depends on the types of connectors coming out from your fans:

If your fan has the 4-pin connector (as in the third fan connector shown in the photo above), it is likely a PWM fan (which, usually, most CPU Fan Coolers are). Use the CPU_FAN for the CPU Fan Cooler.

If your fan has the 3-pin connector (as in the second fan connector shown in the photo above), it is likely a DC fan. Use any of the other fan headers in your motherboard (the 4-pin CHA_FAN1 for speed control or the 3-pin CHA_FAN2 or PWR_FAN for full-speed). Note that you can plug in a 3-pin fan connector on a 4-pin fan header by aligning the tab to the groove like this:

If your fan has the 2-pin connector (as in the first fan connector shown in the photo above), it is a DC fan with no speed reading connection. You would need a 2-pin-to-3-pin fan adapter cable such as this (https://www.amazon.com/pin-fan-adapter-cable/dp/B002PNL3IS) for you to convert the 2-pin connector to a 3-pin and be able to plug in to any fan headers mentioned above (note that the motherboard will not be able to read the fan speed due to the absence of the 3rd wire/pin)

If your fan has the Molex connector (as in the fourth fan connector shown in the photo above), it is a DC fan with no speed reading connection and should be plugged directly to your Power Supply's Molex power cable, which looks like this: