I see my Intel DZ68BC mobo has 4-pin fan connectors. I can't, however find any fans on the market that has 4 pins. What does the 4th pin do and does anyone know who makes 4-pin fans?
I think it controls the fan speeds and if possible I'd like to have the mobo control the fans just to see how that works out.
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It's rather silly; only CPU HSFs are 4-pin. You can still connect 3-pin fans to 4-pin headers and get speed control.
One wire is ground, one wire is power, one is fan tach, one is fan speed adjustment. You can get fan speed adjustment with 3 or 4 pin fans. I have noticed with some 4 pin fans they can make a horrible squealing noise if not running at 100%.