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What Seaberry Pi is—and what you need
Seaberry Pi is a carrier board, not a complete Raspberry Pi computer. You need a Compute Module 4 (CM4) to use it. CM4 models vary in RAM, onboard eMMC storage and wireless configuration, so choose a module that suits the system you intend to build. Raspberry Pi’s CM4 product brief lists RAM capacities of 1 GB, 2 GB, 4 GB and 8 GB, and storage options with no eMMC or 8 GB, 16 GB or 32 GB of eMMC.
CNX Software’s November 2021 specification report also lists Radxa CM3 and Pine64 SOQuartz compatibility. That is a reported compatibility claim, not a guarantee for every module revision or configuration; check current board documentation before choosing a non-CM4 module.
How many PCIe connectors does it provide?
A 2021 layout report describes eleven PCIe connector positions:
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- 16PIN Ribbon Cable Connectivity: Connects seamlessly to Raspberry Pi 5 via a 16PIN ribbon cable for easy integration.
- PCIe Interface Expansion: Designed with a 16PIN PCIe interface based on Raspberry Pi 5, enabling smooth PCIe interface expansion.
- Flexible Combination: Allows for flexible configurations, easily stacking multiple PCIe HAT modules for enhanced functionality.
- PCIe Gen2 Speed: Supports PCIe Gen2 (PCIe 2.0) speed for reliable data transfer and efficient performance.
- Exclusive Compatibility: Fully compatible with Raspberry Pi 5, ensuring optimal performance and versatility in various applications.
- One x16-length slot wired for x1.
- One x1 slot.
- Four mini PCIe slots.
- Four M.2 Key E slots.
- One M.2 Key M socket, specified for an M.2 2280 NVMe SSD.
The connector count describes physical options, not separate host lanes. Raspberry Pi specifies a PCIe Gen 2 x1 interface on the CM4, and Seaberry’s expansion connects through that one interface. Multiple devices therefore share the same upstream connection; the connector variety can make different add-ons easier to connect, but does not create additional PCIe bandwidth.
Can you use an NVMe SSD?
The M.2 Key M socket is reported as a route for an M.2 2280 NVMe SSD using the CM4’s x1 PCIe connection. The specification identifies the intended drive type and size; it does not establish compatibility with every SSD or report a validated model or benchmark. The SSD is a separate component, and actual results depend on the drive, software and shared PCIe connection.
Rank #2
- Expanded Storage Capacity --- The M.2 NVMe SSD Adapter enables you to connect M.2 NVMe SSDs to your Raspberry Pi, providing a significant boost in storage capacity. This allows you to store and access large amounts of data, making it ideal for data-intensive projects and applications. It’s compatible with Raspberry Pi, and supports M.2 NVMe SSD. (NOTE: Raspberry Pi Board or M.2 NVMe SSD Not Included)
- Easy Installation and Compatibility --- The M.2 NVMe SSD Adapter is designed for easy installation, connecting to the Raspberry Pi via pogo pins without requiring complex wiring or soldering. It is also compatible with various models of Raspberry Pi, providing flexibility and convenience for different projects.
- Compact Form Factor --- With its compact design, the adapter board seamlessly integrates with your Raspberry Pi without adding unnecessary bulk. This is especially important for projects where space is limited, ensuring efficient utilization of the Raspberry Pi's footprint.
- Versatility and Future Scalability --- The M.2 NVMe SSD adapter board expands the range of applications and projects you can undertake with your Raspberry Pi. Whether you're building a media center, a network storage solution, or a high-performance IoT gateway, the adapter board provides scalability, allowing for easy upgrades or replacements of SSDs as your needs evolve.
- Package Includes --- 1x M.2 NVME SSD Adapter,1x USB Adapter, 1x Screw Pack, 1x Acrylic Panel, 1x Screw Driver
The board report also lists two SATA ports, providing another stated storage interface. The available source does not establish specific SATA-drive compatibility or performance, so verify the current board documentation for your intended drives and setup.
What other I/O is reported?
CNX Software’s 2021 specification report lists these additional connections and features:
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- Designed for Raspberry Pi Compute Module 4 IO Board; 4x USB 3.2 Gen1 ports, USB 3.0 / 2.0 / 1.1 compatible
- Flexible power supply options: powered from either PCIe 12V, OR from 12V DC header
- Onboard VL805 chip, driver free, plug and play
- When used with PC mother board, you'd better connect it through a PCIe extension cable
- Two HDMI outputs, one MIPI DSI connector and one MIPI CSI connector.
- Two USB 2.0 ports and Gigabit Ethernet.
- A micro USB connection for programming CM4 modules with eMMC.
- A microSD slot for CM4 Lite, plus GPIO, RTC, a fan connector and a serial console.
- Two SATA ports.
The same report describes a 170 × 170 mm Mini-ITX board and 12 V DC input options. Confirm power requirements, connector details and mechanical fit against current manufacturer documentation before designing a build around them.
How Seaberry compares with the official CM4 IO Board
Raspberry Pi’s official CM4 IO Board is a general-purpose development carrier with a single PCIe Gen 2 x1 socket. The practical distinction is connector choice: Seaberry’s reported layout offers many types of expansion sockets, while the official board keeps PCIe expansion to one socket. Neither changes the CM4’s single-lane PCIe interface.
Rank #4
- ✅ Expand Rasp-berry Pi 5 with 4 PCIe Channels: This PCIe HAT adapter expands the single PCIe interface on Rasp-berry Pi 5 into 4 PCIe FFC connectors, ideal for running multiple PCIe devices simultaneously.
- 🔌 Flexible Multi-HAT Stacking for PCIe Expansion: Supports the stacking of multiple PCIe HATs for Raspberry Pi 5, allowing you to customize your system with SSDs, network cards, capture devices, and more.
- ⚡ High-Speed PCIe Gen2 Transmission Interface: Compliant with PCIe Gen2 (2.0) standard, this adapter ensures stable and efficient bandwidth for all connected devices, perfect for high-speed peripherals.
- 🔧 Plug-and-Play PCIe Expansion Board with 16PIN Interface: Easily connects to the 16PIN PCIe port of the Rasp-berry Pi 5 using a flat cable (included), providing immediate access to four independent PCIe slots.
- 📦 Compact PCIe HAT Adapter for Raspberry Pi DIY Projects: A compact and efficient solution for DIY developers, makers, and engineers seeking to build modular PCIe systems on Rasp-berry Pi 5, such as NAS, AI accelerators, and more.
Availability and support
CNX Software’s 2021 article reported a Tindie listing, but that historical listing does not establish current price, stock, board revision or vendor support. Check the seller’s current listing and documentation before purchase. Raspberry Pi says CM4 will remain in production until at least January 2034, according to its July 2026 product brief; that lifecycle statement concerns the module, not Seaberry availability.
Sources: CNX Software’s Seaberry specification report (November 25, 2021); Jeff Geerling’s 2021 Seaberry build report; Raspberry Pi Ltd’s Compute Module hardware documentation.
Quick Recap
Best Value
- Support NVMe protocol and M.2 solid state drive protocol, high-speed read/write, with high work efficiency.
- PCI-E×1 only supports Gen2 or Gen3 mode.
- Only supports PI5B. Compatible with M.2 solid state drive of 2230/2242 sizes.
- Onboard working indicator lights, with PWR on continuously when powered, and ACT blinking during read/write.
- Integrate heat dissipation and M.2 expansion.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
