I'm looking for a power supply for my custom build PC with non-Dell motherboard and a PSU + power distribution module (PDM) from T7920 could make a perfect fit but I'm suspicious that Dell uses standard ATX harness. A PSU itself provides only 12V rails while ATX connector requires 3.3V and 5V rails also. I've spent some time trying to figure out if there are any secondary DC-DC converters on that PDM board but found none.

Would appreciate any advice.