TheCompute Module 4 IO boardincludes a 1x PCIe Gen 2.0 slot allowing you to add additional hardware to yourCM4projects.
This PCI-E to 4-channel SATA 3.0 adapter board adds a low latency, low-power AHCI controller to your CM4 IO board, allowing you to build up various high-speed IO systems, including servers, high-capacity system storage or surveillance platforms.
In addition to the power supply from the PCI-E interface, there's also a power header for an external 5v/12v input. LED indicators are onboard for each SATA channel, flashing whenever data is read/written.
Note
The module is PCIe Gen 3 interface but the Raspberry Pi CM4 is PCIe Gen 2 interface, therefore the max speed is 5Gbps
Supports 5V/12V SATA Hard Disks. Does not Support the M.2 Interface
Does not support direct access to a PC motherboard
Storage, CM4 and IO board are not included
Features
Supports single-channel PCI Express
Four power-saving modes of L0s/L1/L23/L3
Support L1 sub-state deep power saving mode
Supports SRIS, AER, LTR
Supports SATA LED
Supports NCQ & AHCI SPEC 1.4
Four SATA3.0 (6Gbps) ports
Supports the switching based on the port multiplier commands