3.3V Power Rail Requirements

Hello,

I finally got a CM4 to populate my Interceptor. I am planning to build a small NAS using an old 4 bay SCSI enclosure with a 240W power supply. Since it only has 5 and 12V rails available, I was wondering if you had any data on typical and maximum draw on the 3.3V line in operation. I was thinking of adding a DC-DC converter module to get the 3.3V, I just need to make sure I get one that is big enough.

Thank you for your help.