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Green PCB with silver M.2 edge connector and four blue USB 3.0 ports, silver heatsink on black chip

SMUGDESK

SMUGDESK ASM1184E M.2 MKey to 4-Port USB 3.0 PCIe Expansion Adapter

SKU CH-21AZ-RHVJA

Converts one M.2 MKey PCIe lane into four USB 3.0 ports for multi-GPU riser expansion with a built-in heatsink

  • ASM1184E chip splits one M.2 MKey lane into four PCIe x1 channels
  • Four USB 3.0 ports enable multi-GPU riser expansion from a single slot
  • Dedicated aluminum heatsink keeps the controller cool during sustained heavy loads
  • Four-layer anti-interference PCB preserves signal integrity and reduces packet loss
  • Plug-and-play operation on Windows and Linux with no extra drivers required

M.2 MKey to Four USB 3.0 Ports

This adapter converts a single M.2 MKey PCIe lane into four independent PCIe x1 channels using an ASM1184E controller. It is designed for desktop builders who need additional PCIe connections for GPU risers or other expansion cards when motherboard slots are limited. The card only works with M.2 MKey NVMe PCIe slots and is not compatible with BKey or SATA M.2 interfaces.

Built-in Heatsink and Four-Layer PCB

A dedicated aluminium heatsink covers the main controller to maintain stable temperatures during continuous operation. The four-layer PCB design reduces electromagnetic interference and optimises impedance matching for reliable signal integrity across all four channels. USB 3.0 ports serve as the physical connectors for PCIe riser cables, providing a plug-and-play experience on Windows and Linux without extra drivers.

Passive Cooling for Continuous Loads

The passive heatsink dissipates heat from the ASM1184E chip without adding fan noise, making it suitable for long-running multi-GPU compute or mining workloads. Power is drawn directly from the M.2 slot to supply the controller and connected riser devices. The board focuses on signal stability and thermal management rather than active cooling components.

How it compares

Measured against everything we stock in Interface & Card Adapters, at today’s prices. Recalculated every night.

Price $12.99
Cheaper than about 85% of the 354 comparable items (median $21.99).

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Specifications

No published specifications for this item yet.

Questions about this item

What PCIe speed does the ASM1184E chip provide to each of the four USB 3.0 ports?

The ASM1184E splits a single M.2 MKey PCIe lane into four independent PCIe x1 channels, so each USB 3.0 port operates at PCIe x1 speed.

Which M.2 slot keying and protocol must the motherboard provide for this adapter to work?

The adapter only fits an M.2 MKey slot wired for NVMe PCIe; it is not compatible with M.2 BKey or SATA M.2 slots.

What is the correct installation sequence to avoid the adapter not being detected?

Power off the system, insert the card into the M.2 MKey NVMe slot and secure it with the mounting screw, attach PCIe riser cables to the four USB 3.0 ports, then power on — the driver loads automatically on Windows and Linux.

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