Reply 40 of 54, by Excelsior
luckybob wrote on 2024-09-25, 01:14:you should use ATX. […]
you should use ATX.
Pentium pro is in this awkward position between AT and ATX. You actually have a psudo-ATX supply in that system. If you use an AT power supply (or use an adapter) the system may work fine. But anything that uses 3.3v will not work. This might only be PCI slots. Or it could be both PCI slots and the RAM.
This was the big transition from 5v to 3.3.
They do make ATX to AT converters, that include the 3.3v aux connection, if you must replace the power supply, I would start here.
edit: in your pic, there is a 3-pin connection as well. Dollars to doughnuts, its +5vsb, pgood and the atx start signal wire. Its really a bastard PSU, and was common for pentium pro systems.
Thank you for your reply!
Just to be clear: my system came without any PSU at all (the previous owner had it removed for being faulty) and this is why I was asking if I can use a normal (and modern) PSU with an adapter. If I use a new ATX PSU to power up my system what changes should I make? The adapter alone is enough or there is something more I need to use?