Rock5B: PCIe power watts? (Total, and on the 12V and 3.3V)

[rock]

Hi!

The Rock5B has two PCIe slots - one 22x32mm M.2 slot on the upper part and one 22x80mm M.2 slot on the lower part.

What is the total aggregate watt consumption supported for these PCIe slots?

From the USBC PD thread Rock5B SBC: Voltage on the USB-C Power Delivery input. Rock5B+peripherals watts consumption I’m aware the Rock5B negotiates the highest voltage it can, meaning the USBC PD will feed probably 20V or 18-19V, but could be 15V or 12V (or in extreme case even 9V or 5V) too.

Meanwhile, a PCI card will take a 12V input and a 3.3V input.

Some NIC with stated 15W electricity consumption - and not sure which split it has between 12V and 3.3V - will it work on the Rock5B, when drawing power only from the Rock5B (“bus power”) with no separate power supply to the PCIe card?

@jack

[dominik]

What is the total aggregate watt consumption supported for these PCIe slots?

Two nvme drives work, so probably they can draw about 20W at peak.

Some NIC with stated 15W electricity consumption - and not sure which split it has between 12V and 3.3V - will it work on the Rock5B, when drawing power only from the Rock5B (“bus power”) with no separate power supply to the PCIe card?

Depends on particular card. There are some working only on 3.3V (like nvme adapters).
Try to find same card in m.2 format. If there is something then probably is only 3.3V or has some port for power (like sata power cable).