nd22 wrote on 2022-02-07, 07:28:

I have encountered a problem building a socket 478 machine that I think is common on socket 478/423 and maybe other sockets too: […]
Show full quote

I have encountered a problem building a socket 478 machine that I think is common on socket 478/423 and maybe other sockets too: modern power supplies are missing the auxiliary power connector that are required on some motherboards - example Abit TH7-raid/ TH7II-raid. This is not the same connector present in some proprietary PSU such as those manufactured by HP or Dell! The presence of this connector is required for the system to start; I have one old PSU from FSP that has the connector but I also use it for early socket 462 builds because of the 5V rail however and being already old I see a potential problem in the future. I searched and found some adapters on Ebay however they are for specialist PSUs such as the ones from HP and not general purpose ones. Even those that are general purpose use the main ATX 12V to provide the auxiliary connector however you loose the main connector in the process!
Is there an adapter that can be fit to a modern PSU that can convert the ATX / Molex connector into auxiliary one while also keeping the main ATX available? The end result would have the following connectors present:
1. ATX 12V
2. P4 connector
3. auxiliary power connector
This is the one I am talking about:

You mean these types of adapter

https://www.atxpowersupplies.com/6-pin-aux-co … tor-adapter.php
https://www.mypccase.com/20pinexcowi6.html
https://store.cwc-group.com/20atxpoextca.html

Suspect postage from the US to your locale would make them uneconomic - why not just find a suitable (dead) donor PSU locally and cut & splice the connector yourself; its an easy solder / heatshrink job.

I ordered the model from the third link for my P4 build not too long ago... It works well, but I had to cut off the little nibs on the side opposite the retention clip to get it to insert. This is on a QDI motherboard.

Such annoyance, these connectors. The P4-era ones provide 3.3V and 5V, and I wonder whose great idea was to reuse the ones that were used earlier for 3.3V only, that in turn were reused from even earlier ones that provided 5 volts. I have such an old AT psu that has a third identical connector besides P8/P9, with three ground and three 5V wires. Add the proprietary HP, Dell and whatever, and you have a real clusterf'k.