it depends on the cpu. I program microcontrollers that have as few as 8 pins, cpu's on motherboards have many more as they are required to interface with external devices such as memory busses. usually in excess of 200. more modern processors don't have pins, they have contact points which meet contact points on the mainboard. pins are a relative point of discussion but not necessarily factual.
4
4 pins
4
4 pins
guessing is ok when connecting a wire to a front panel header connection. if It doesn't work no harm is done
guessing is ok when connecting a wire to a front panel header connection. if It doesn't work no harm is done
guessing is ok when connecting a wire to a front panel header connection. if It doesn't work no harm is done
24 pins
Legacy CPU fans used a 3-pin header. Anything in the past few generations and current use a 4-pin straight configuration now-- The majority of 3 pin fans work on most 4-pin plugs, but I don't know if the inverse is true.
== == 24-pins
jumpers
pins
ATX version 2.2 allowed for 24-pin P1 connector, which is backward compatible with the 20-pin P1 connector.
the regular ATX has a 20 pin power connector, while the enhanced ATX power connector has 24 pin power connector.
24