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Blue rectangular circuit board with HDMI, USB, Ethernet, CSI, DSI, M.2 and microSD connectors

Bazarc

Bazarc CM4-IO-BASE-A server accessory BCM2711 5V 3A

SKU CH-CTJS-KQS9N MPN CM4-IO-BASE-A

Expansion board for Raspberry Pi Compute Module 4 with BCM2711 chip, Gigabit Ethernet, HDMI, USB, CSI, DSI, M.2 and microSD interfaces

  • Quad-core BCM2711 processor powers demanding compute tasks
  • Gigabit Ethernet with IEEE 1588 support enables precise network timing
  • PCIe expansion slot allows flexible module additions
  • 5 V 3 A supply delivers stable power to the module
  • Blue board design aids quick visual identification

Dedicated CM4 Base Board

The Bazarc CM4-IO-BASE-A is a purpose-built expansion board for the Raspberry Pi Compute Module 4. It provides a stable B-to-B connector interface and a 5V 3A power input to support the BCM2711 processor. The board breaks out HDMI-compatible video, Gigabit Ethernet, USB, CSI, DSI and fan headers for rapid prototyping.

Engineers needing full I/O access

This board suits developers who require direct access to every CM4 interface including PCIe and M.2 expansion in a compact form factor. It is not for users who only need a basic carrier with fewer ports or those building inside enclosures that cannot accommodate the full breakout layout.

BCM2711 quad-core Cortex-A72 processor

The on-board BCM2711 chip delivers 64-bit performance with four Cortex-A72 cores for compute-intensive tasks. Gigabit Ethernet with IEEE1588 support enables precise network timing. An M.2 slot and PCIe interface allow flexible storage or accelerator additions.

How it compares

Measured against everything we stock in Drive Cages & Server Add-Ons, at today’s prices. Recalculated every night.

Price $136.99
Pricier than about 69% of the 1,119 comparable items (median $74.99).

New to this? Buying server hardware with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

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Product typeOther

Questions about this item

What mounting holes or standoffs does the CM4-IO-BASE-A need to secure the Compute Module 4?

The board uses a B-to-B connector to mate with the Compute Module 4, replacing the gold-finger design of earlier CM boards for a more stable mechanical connection.

Which step is most often missed when installing the CM4-IO-BASE-A with a Compute Module 4?

Aligning the Compute Module 4 precisely on the B-to-B connector before pressing down evenly; misalignment can bend pins and prevent the board from booting.

Which on-board interfaces on the CM4-IO-BASE-A may need a cable or module replacement over time?

The CSI and DSI flat-flex cables, the micro-SD card, any M.2 expansion card, and the fan header are the parts most likely to require replacement after extended use.

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