ATX power supplies follow a closely defined standard ... The same goes for the wiring loom of motherboard and disk power connectors, a handy source of medium-sized hook-up wire.
The power supply blows air over the CPU ... but to place all the connectors directly on the motherboard. Prior to the ATX, only the keyboard connector was attached to the motherboard.
With the ATX standard also came the ATX power supply (PSU), the standard for which ... the new 12 VSB standby voltage rail. The 4-pin 12 V connectors would still remain, and still require one ...
All except its low-end series use the ATX 3.1 and PCIe 5.1 standards ... all with dual 12v 2x6 connectors and modular cables. These power supplies use Japanese capacitors, Infineon CoolMOS ...