How do I plug into my GA-Z77X-D3H Z77's "fan" slots?

The Gigabyte GA-Z77X-D3H Z77 board has several "fan" slots, above and beyond the "cpu_fan." These look like they have a small 4 pin input, but all my case fans (and other fans I have) have a 3 pin input. What exactly are these slots on the board for? Are they not for case fans, and am I misunderstanding? Or do I just not have the right kind of fans?

Thanks so much!
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More about plug z77x slots
  1. http://www.tomshardware.co.uk/forum/285719-10-case-motherboard-connector

    Both the motherboard and the fan cable should be labeled. The 4th pin gives you a feature that automatically adjusts your fans' speeds according to the computer's workload (more work for the computer = more fan speed), but the fans will still work just fine without this additional feature.
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