Q:Can the eMMC be swapped later, if needed?
A: Since the EMMC is directly welded to the product, it is not recommended to replace it by yourself, as it is easy to damage the product. 4B+ offers the following options. At the same time, if you want to easily replace the EMMC, you can choose 4B, and its emmc can be installed as needed.
2GB DDR4 - 16GB EMMC
4GB DDR4 - 32GB EMMC
4GB DDR4 - 64GB EMMC
4GB DDR4 - 128GB EMMC
Q: What hat do you need for PoE?
ROCK Pi 23W PoE HAT is a HAT accessory designed for Raspberry Pi, ROCK Pi 4, and Jetson Nano. The 23W PoE HAT allows you to power your Raspberry Pi, ROCK Pi 4 or Jetson Nano using Power over Ethernet–enabled networks; for this product to be used, the network it is connected to needs to have power-sourcing equipment installed.
ROCK Pi 13W PoE HAT is a HAT accessories designed for ROCK Pi 4, ROCK Pi E, Raspberry Pi 3B+/4, Jetson Nano or ROCK Pi X. The ROCK Pi 13W PoE HAT allows you to power your ROCK Pi 4, Raspberry Pi 3B+/4, Jetson Nano or ROCK Pi X using Power over Ethernet–enabled networks; for this product to be used, the network it is connected to needs to have power-sourcing equipment installed.
Q: Can I use the Raspberry Pi PoE HAT for ROCK Pi model B?
A: No. The official Raspberry Pi PoE HAT is not mechanical compatible with ROCK Pi 4 model B, besides, the official Raspberry Pi PoE HAT can not provide enough power for ROCK Pi 4. We have made a PoE HAT which can provide up to 22.5W power to ROCK Pi 4. ROCK Pi PoE HAT also supports Raspberry Pi 3B+ and 4.
Q: How much mA can i get from the USB 3 and 2 ports for charging or use a 2.5" disk?
A: The upper USB3.0 OTG has one dedicated current limit control which is 1.45A. The rest USB 3.0 HOST and the two USB 2.0 HOST share a current limit control of 3A together.