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Green circuit board with four PCIe slots and ASM1184 chip

WaveShare

WaveShare 4-CH PCIe Gen 2 x1 Expander ASM1184

SKU CH-RV56-CDCJ9

Adds four PCIe 2.0 x1 slots from one lane using an ASM1184 controller, driver-free and powered from PCIe or 12 V DC header

  • Expands one PCIe lane into four Gen 2 x1 sockets for more add-in cards
  • ASM1184 controller enables driver-free plug-and-play operation
  • Powered from PCIe 12 V or optional 12 V DC header for flexible installs
  • Backward compatible with PCIe Gen 1 x1 devices
  • Designed for riser or backplane use — not for direct motherboard insertion

4-Channel PCIe Gen 2 Expander

This WaveShare board converts a single PCIe lane into four Gen 2 x1 sockets using an ASM1184 controller. It is built for developers and integrators who need extra expansion slots inside a mini-PC or embedded chassis. The card draws power from the PCIe 12 V rail or an external 12 V DC header. No drivers are required for operation.

Suits embedded builds not direct PC install

The expander targets system builders adding capture cards, network adapters or storage controllers to space-constrained platforms. It is not intended for users who want to plug the board straight into a standard desktop motherboard. Buyers needing a simple riser for a full-size graphics card should look elsewhere.

ASM1184 controller with driver-free operation

The ASM1184 chip manages all four downstream ports at PCIe 2.0 speeds without any software installation. This single specification decides whether the board fits a project that requires transparent, hot-plug expansion. If the host platform cannot supply 12 V through the slot or header, the expander will not function.

How it compares

Measured against everything we stock in Mini PC Barebone Systems, at today’s prices. Recalculated every night.

Price $60.99
Cheaper than about 97% of the 1,735 comparable items (median $564.99).

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Specifications

Processor
ProcessorOther

Questions about this item

How do I verify the ASM1184 expander is working after installation?

The controller is driver-free and plug-and-play; the host system should enumerate four separate PCIe Gen 2 x1 links without extra software.

What comes in the box and what must I source separately?

The board itself is supplied; you must provide a 12 V DC header cable or rely on the PCIe slot 12 V rail for power.

Which version of this expander should I choose for my setup?

This model provides four PCIe Gen 2 x1 sockets from one upstream lane using the ASM1184 controller.

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