I have started the planning of a new project here, this includes the use of ATX 24 pin breakout board with screw terminal block.
( I did my choice again by reviewing photographs of all over the planet earth, because such PCB designers they lacking skills at proper product description.)
Generic description: 24/20-Pin ATX Computer Benchtop Power Supply Board Breakout Adapter Module
Price when market was stable 3$ USD, now its double.
Spesific PCB this is not 1:1 voltage rails wire to its one end point = screw terminal block
For example 3.3V rails (three wires at right side of ATX plug) they are sorted at PCB connector side.
Fourth 3.3V wire this is sorted over the PCB with the other three 3.3V wires.
Another detail hides at screw terminal block specifications.
Voltage rating (UL/IEC): 250V
Current rating (UL/IEC): 16A
Contact resistance: 20 mΩ
Wire gauge: 22-14 AWG --- 1.5mm
Wire strip length: 5 mm
Thru hole pin 1.0 mm
KF301-4P 5.08mm 4 Pin Connect Terminal Screw
ATX - wire - Molex - limits
Actual ATX PSU per wire DC current this is up to 10A
Actual MOLEX per pin DC current limits this is 5A continues, and 7A for dynamic loads (non continues).
four pin header
They are seven of them, and not documented at all regarding their output.
Some of the headers have all pins sorted, some others do not.
To be continued.... ( I am currently waiting for PCB arrival, and I will explore more details as soon it arrives).