Cable-wise, what do I need to add?
One Pico ATX module, some 6-pin to sata ?
huh?
Ideally, I'd like to power an SSD
and an HDD.
I myself have server PSU for GPUs and a normal ATX PSU for other components. Works really well, PICOs are nice too but if you want to power both the SSD and HDD you will need 1 MOLEX to SATA adapter.