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Choose the carrier board only after identifying the exact compute module and its connector. Then match the board’s exposed interfaces, power input and peripheral budget, storage variant, physical constraints, and intended use. Raspberry Pi CM4 and CM5 boards are not automatically interchangeable, and a Raspberry Pi carrier should not be assumed to work with Banana Pi’s BPI-CM7 simply because both modules use two 100-pin connectors.
Start with the exact module, not the brand name
A carrier board routes power, storage and I/O to a compute module. Its connectors, pin assignments and electrical limits must match the module installed on it. The first shopping decision is therefore the module generation and connector type.
Raspberry Pi Compute Module 4 and Compute Module 5
CM4 and CM5 use two 100-pin high-density board-to-board connectors. Their official development carriers are the CM4IO and CM5IO boards respectively. Raspberry Pi documents cross-generation use in both directions, but with reduced functionality. A board that physically accepts a module may still lack a usable interface, expose fewer features, or require you to verify a particular signal in the detailed documentation.
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Compute Module 1, Compute Module 3, Compute Module 3+ and Compute Module 4S use the DDR2 SODIMM-style module family rather than the dual 100-pin CM4/CM5 connector system. Raspberry Pi lists CMIO3 for CM1, CM3, CM3+ and CM4S, while CMIO version 1 is listed for CM1 only. CMIO3 added a microSD slot compared with version 1.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Do not select a board because its product name contains “Compute Module.” Check the manufacturer’s compatibility table for the precise module revision. A SODIMM carrier and a dual-100-pin carrier belong to different mechanical and electrical ecosystems.
Turn the project into an interface checklist
Before comparing boards, write down every connection the finished device or test setup needs. Count ports rather than relying on a general description such as “multimedia” or “industrial I/O.”
- Display outputs: number of HDMI connections and any DSI display flex cables.
- Cameras: number of CSI-2 camera flex cables and whether a connector must also support a display.
- USB: required connector type, USB generation and number of ports.
- Networking: Gigabit Ethernet, Power over Ethernet, wireless requirements and any external antenna arrangement.
- Expansion: 40-pin GPIO/HAT compatibility, voltage selection, fan control and PWM requirements.
- Storage: microSD, onboard eMMC, PCIe storage or an M.2 socket.
- Service and test connections: upstream USB, configuration jumpers, RTC battery and debug access.
- Mechanical limits: board footprint, connector clearance, mounting holes, enclosure height and cable bend radius.
Mark each item as required, desirable or unnecessary. A development board can be worthwhile when it exposes every signal needed for bring-up, even if the final product will use a smaller custom board.
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Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Compare the official Raspberry Pi development carriers
The following comparison uses the features Raspberry Pi documents for its two current general-purpose I/O boards. “Reduced functionality” means the board can be used with the other listed module generation, but not every board feature is available.
| Characteristic | CM4IO | CM5IO |
|---|---|---|
| Primary module | CM4 | CM5 |
| Other documented module | CM5, with reduced functionality | CM4, with reduced functionality |
| Video | Two HDMI ports; two MIPI DSI display FFC connectors | Two HDMI ports; two combined MIPI DSI/CSI-2 camera-display FFC connectors |
| USB | Two USB 2.0 connectors and one micro USB upstream port | Two USB 3.0 Type-A ports and one USB 2.0 Type-C port |
| Networking | Gigabit Ethernet with PoE support | Gigabit Ethernet with PoE support |
| Expansion | 40-pin GPIO/HAT footprint and PoE header | GPIO/HAT footprint, PoE header, selectable GPIO voltage and four-pin PWM fan connector |
| PCIe or storage expansion | PCIe Gen 2; microSD slot for CM4Lite | M.2 M-key PCIe socket for listed 2230, 2242, 2260 and 2280 devices; microSD slot for CM5Lite |
| Other board features | RTC battery socket and configuration jumpers | RTC battery socket |
| Power input | 5 V through GPIO or 12 V barrel input; documentation allows up to 26 V only when PCIe is unused | USB-C input at 5 V, 5 A or 5 V, 3 A with a 600 mA peripheral limit |
When CM4IO is the logical choice
Use CM4IO when the module is CM4 and you need a broad evaluation platform: dual HDMI, two USB 2.0 ports, Ethernet, PCIe access, a 40-pin header, camera and display FFC connectors, or configuration and RTC hardware. Its barrel input can simplify a bench setup, but the voltage and PCIe condition must be respected. If you install CM5 instead, verify every required interface because Raspberry Pi specifies reduced functionality in that combination.
When CM5IO is the logical choice
Choose CM5IO for a CM5 development system that benefits from USB 3.0, the M.2 M-key socket, combined camera/display FFC connectors, selectable GPIO voltage or the dedicated PWM fan connector. Its USB-C power specification is not interchangeable with a generic “phone charger” assumption: the board is documented for 5 V at 5 A for a 25 W input, or 5 V at 3 A for a 15 W input with a 600 mA peripheral limit. A CM4 can be used only with the documented reduced-functionality caveat.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Check power before connecting peripherals
Power problems often appear as random resets, USB dropouts or storage corruption. Evaluate the carrier, module and attached devices as one power system.
CM4IO input choices
CM4IO accepts 5 V through the GPIO header or 12 V through its barrel connector. Raspberry Pi’s documentation states that the board can support up to 26 V when PCIe is unused. That is a conditional allowance, not a general instruction to apply 26 V while operating every interface. If your design needs PCIe, select an input within the documented PCIe-enabled conditions and follow the board’s power guidance.
CM5IO USB-C limits
CM5IO specifies USB-C input at either 5 V and 5 A, equivalent to 25 W, or 5 V and 3 A, equivalent to 15 W. In the 3 A case, Raspberry Pi documents a 600 mA limit for peripherals. Add the expected load of USB devices, an M.2 device, fans and other accessories before choosing the supply mode. A supply that powers the module alone may not provide the headroom required by the complete setup.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Power questions to answer in your design
- What voltage and connector does the carrier officially accept?
- Will PCIe be populated, and does that change the allowed input range?
- How much current can attached USB, storage, cooling and HAT hardware draw?
- Does the enclosure need a regulated input, fuse, reverse-polarity protection or a controlled shutdown circuit?
- Will the production carrier use the same power arrangement as the evaluation board?
Match the storage variant
Raspberry Pi offers module variants with different storage arrangements. The microSD sockets on CM4IO and CM5IO are for the respective Lite modules without eMMC. If the installed module includes eMMC, the carrier’s microSD socket does not replace that onboard storage; the module variant determines which storage path is used.
Confirm the exact suffix printed on the module before planning an operating-system image or recovery process. For CM4, decide whether the product needs a Lite module with removable microSD or an eMMC-equipped module. For CM5, apply the same decision to CM5Lite and the eMMC variants. If your software image, field-update process or service procedure depends on removable media, make that requirement explicit rather than assuming every Compute Module exposes the socket.
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CM5IO adds an M.2 M-key PCIe socket supporting the listed 2230, 2242, 2260 and 2280 form factors. CM4IO provides PCIe Gen 2 but does not present the same integrated M.2 socket. Check the mechanical length, keying, thermal clearance and software support for the storage device you intend to use.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Understand the BPI-CM7 path separately
BPI-CM7 is a different module family. Banana Pi describes it as an Allwinner H618 module with LPDDR4 memory, eMMC, K019 Wi-Fi 5, Bluetooth 5.0 and two 100-pin board-to-board connectors. Banana Pi documents BPI-CM7IO as a carrier designed for BPI-CM7.
The matching connector count does not establish compatibility with Raspberry Pi CM4IO or CM5IO. Connector pin assignments, power rails, boot behavior, signal levels, mechanical keying and firmware support can all differ. Treat BPI-CM7 and Raspberry Pi Compute Modules as separate ecosystems unless a manufacturer explicitly documents a particular module-and-carrier combination.
What is established about BPI-CM7IO
The available Banana Pi documentation identifies BPI-CM7IO as the dedicated carrier for BPI-CM7. Detailed interface lists, power specifications, dimensions and current availability should be taken from the current BPI-CM7IO documentation before purchase or layout work. Do not fill those gaps by copying specifications from CM4IO or CM5IO.
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- Verify that the board’s compatibility statement names BPI-CM7, not merely a generic 100-pin module.
- Compare the mechanical drawing and connector orientation with the module.
- Confirm every required interface in the BPI-CM7IO documentation.
- Confirm input voltage, current capacity, storage behavior and thermal provisions.
- Check current supply status and revision notes before committing to a production design.
Development carrier or custom production board?
Raspberry Pi describes its IO boards as general-purpose boards for development, testing and prototyping. They are useful for bringing up software, measuring signals, validating cameras and displays, and proving a peripheral selection.
For production, Raspberry Pi explicitly suggests designing a smaller custom carrier that includes only the connectors needed for the use case. A custom board can reduce footprint, eliminate unused connectors, place interfaces where the enclosure requires them and integrate power, protection, mounting and thermal features. It also creates responsibility for high-speed routing, signal integrity, compliance testing, manufacturing files, component lifecycle and service access.
Stay with the development board when
- You are still selecting cameras, displays, storage or HAT hardware.
- You need the full set of exposed interfaces for laboratory testing.
- Low volume and a larger enclosure are acceptable.
- Your priority is software validation rather than a final mechanical design.
Move to a custom carrier when
- The product needs a smaller or shaped PCB.
- Unused HDMI, USB, audio or expansion connectors consume space or cost.
- Power entry, protection, connectors or mounting points must match a fixed enclosure.
- You need controlled production revisions and a documented manufacturing test process.
- The carrier will be deployed for a long-lived product and its module and components must be checked for lifecycle availability.
A practical selection procedure
- Record the module. Write the exact family and variant: CM4, CM5, an earlier SODIMM-based module, or BPI-CM7. Include Lite versus eMMC where applicable.
- Verify the connector. Confirm dual 100-pin versus SODIMM, connector orientation, mating hardware and the manufacturer’s compatibility statement.
- List mandatory interfaces. Count HDMI, USB, Ethernet, PCIe or M.2, camera and display FFCs, GPIO, fan and service ports.
- Choose the closest documented board. For CM4, start with CM4IO; for CM5, start with CM5IO; for BPI-CM7, start with BPI-CM7IO. Treat cross-generation combinations as exceptions requiring signal-by-signal verification.
- Validate power. Apply the carrier’s input limits, peripheral-current limits and any PCIe condition to the complete load.
- Validate storage. Confirm whether the module uses eMMC, whether the carrier’s microSD slot applies to that module, and whether the required PCIe or M.2 device is supported.
- Check mechanics. Compare PCB dimensions, mounting holes, connector clearance, cable paths and enclosure space.
- Decide development versus production. Use the IO board for evaluation; move to a custom carrier when the product needs a smaller, dedicated or integrated design.
- Recheck documentation and supply. Confirm the exact board revision, module availability and current specifications immediately before ordering or freezing a design.
Common selection mistakes and fixes
| Symptom or mistake | Likely cause | Fix |
|---|---|---|
| The module does not seat or the carrier cannot boot it | Wrong connector family or unsupported module generation | Return to the manufacturer’s compatibility table and verify the exact module and connector. |
| A cross-generation board works but an interface is missing | Reduced functionality in the documented CM4/CM5 cross-use case | Check the detailed board documentation for the specific signal; use the native-generation carrier if the interface is mandatory. |
| The microSD card is ignored | The installed module is an eMMC variant rather than the applicable Lite variant | Confirm the module suffix and use its supported storage path. |
| USB devices disconnect under load | Insufficient input or peripheral-current budget | Recalculate the complete load and use the documented CM5IO 5 V/5 A or 5 V/3 A mode limits, or the appropriate CM4IO supply arrangement. |
| A BPI-CM7 project is planned around a Raspberry Pi board | Connector count mistaken for electrical compatibility | Use the documented BPI-CM7IO pairing unless a manufacturer explicitly confirms another combination. |
| The evaluation board does not fit the final enclosure | Development features and connectors were treated as production requirements | Use the IO board for validation, then design a custom carrier with only the required interfaces. |
What to verify before ordering
- Exact module generation, storage variant and wireless configuration.
- Carrier compatibility statement and board revision.
- Required HDMI, USB, Ethernet, camera, display, GPIO and PCIe connections.
- Input voltage, connector type and total current budget.
- Whether PCIe changes the permitted input range.
- Whether the carrier’s microSD socket applies to the installed Lite module.
- Board dimensions, mounting holes, connector clearance and cooling space.
- Development-only features that will be removed in a custom production carrier.
- Current documentation, availability and lifecycle information for the exact module and carrier.
There is no single universal carrier board. CM4IO is the documented starting point for CM4 evaluation, CM5IO for CM5 evaluation, and BPI-CM7IO for BPI-CM7. The correct choice is the board whose documented connector, interfaces, power limits, storage behavior and mechanical format match the module and the real workload.
Quick Recap
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