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What is the difference between 20-pins ATX power cables and 24-pins ATX power cables for motherboard? I see that Cooler Master Silent Pro PSU has an extensible plug, showing 20 pins + 4 pluggable pins.
Since I'm having troubles with my motherboard, which has 24 pins, I tried to connect only the first 20 and the system booted up fine.
I'm curious: can any ATX motherboard run with 20-pins power? Will I simply experience lower performance?
"not separate rails" this is not guaranteed today. There are many motherboards that are not backward compatible with 20 pin psu. Only old mobos <= 2010 will be 100% backward compatible. Mobo vendor can use these 4 pins to power up pcie clock generator and related stuff, so without these pins pcie may not work. – puchu – 2019-11-25T11:58:13.467