do modular PSUs have standardised pinouts on the psu itself?

[tarui]

basically i need a new atx power cable (24pin) to connect the PSU to the avalon unit. so i was wondering, can i just use any modular atx cable or must i get the original cable?
i know for the atx cable, at the motherboard's end, all pins are standardised. my concern is whether the pins on the atx port on the PSU are standardised as well.

[fhh]

No

[crazyates]

Nope. The resulting 6pin PCIe connector will always end up the same, but IIRC most manufacturers will make their modular plugs different so you can't use a competitor's cable. You have to use their specific one.