Doesn't doing this means opening up the PSU and will void warranty? Sorry this is beyond me. Just looking for a PSU that can accept custom straight through cables plug and play.
Short answer no. It won't work that way.
The pinout are different from certain PSU.
Even if the same brands like Seasonic P1000 that i had, has a different pinout from the newer Seasonic P1050 that was RMA-ed to me.
For P1050, the GND pinout was inverted from the original P1000. So what i did was to remove all the connectors and reterminate it myself by looking at the pinout diagram on websites.
The connectors for the devices stays the same, the pinout on the PSU side will change from models to models or from brands to brands. So there is no way that any PSU manufacturer will make the same standard pinout with another brand manufacturer. Each brands differs. However there are some brands that will accept the same cable as their pinout are the same. Such cases are usually PSU that are OEM from a certain brands. Then they are most likely to share the same pinout.
But for PSU brands to accept all kinds of custom cables and to be compatible, no.
So if you truly wanna reuse your cables, redo the termination at the end of your cables that suites your PSU pinout. Thats all.
If you do not wanna do something "technical" then you would probably wanna buy from cablemod which has done all the cables for specific brands and models.