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Green circuit board with a single USB-C port and SATA power connector, metal bracket attached

SMUGDESK

SMUGDESK PCIe 3.0 x4 USB-C 3.2 Gen 2x2 Expansion Card ASMedia ASM3242 20Gbps SATA Power Low Profile Bracket

SKU CH-SAN2-XAT3V

Adds a 20Gbps USB-C 3.2 Gen 2x2 port via PCIe 3.0 x4 with SATA power for NVMe enclosures, includes low-profile bracket for compact PCs

  • ASMedia ASM3242 chip delivers full 20Gbps USB 3.2 Gen 2x2 bandwidth
  • PCIe 3.0 x4 four-lane bus removes slot bottleneck for sustained throughput
  • SATA 15-pin power feed keeps NVMe enclosures stable under heavy load
  • Dual brackets fit standard ATX towers and 1U slim chassis
  • Works plug-and-play on Windows, macOS and Linux with UASP acceleration

High-Speed USB-C Expansion Card

The SMUGDESK PCIe 3.0 x4 expansion card adds a single USB-C 3.2 Gen 2x2 port capable of 20Gbps throughput to desktop computers. It uses the ASMedia ASM3242 controller and connects through a full-lane PCIe 3.0 x4 slot compatible with x4, x8, and x16 motherboard sockets. A dedicated SATA 15-pin power input feeds high-load external NVMe enclosures during sustained transfers. Both full-height and low-profile brackets are included for standard ATX towers and compact 1U hosts.

Creators and Workstation Upgraders

This card suits users who need maximum USB-C bandwidth for external NVMe storage, large-file backup, or video material workflows on Windows, macOS, or Linux systems with UASP support. It is not for buyers who require DisplayPort video output or Power Delivery charging from the USB-C port. It is also not for systems that lack a free PCIe x4 or larger slot or an available SATA power connector from the power supply.

ASMedia ASM3242 Controller and 20Gbps Bandwidth

The ASM3242 chip drives the single USB-C port to the full USB 3.2 Gen 2x2 20Gbps specification over PCIe 3.0 x4 lanes. This controller choice determines whether the card can saturate high-performance external NVMe enclosures without a PCIe bottleneck. Verify that your motherboard provides a PCIe 3.0 x4 or wider slot and that your power supply has a spare SATA connector before purchase.

How it compares

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

Price $35.99
Pricier than about 81% of the 354 comparable items (median $21.99).

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Specifications

No published specifications for this item yet.

Questions about this item

How do I install the SMUGDESK PCIe 3.0 x4 USB-C 3.2 Gen 2x2 card and which step is often missed?

Insert the card into a PCIe x4, x8, or x16 slot, secure the chosen full-height or low-profile bracket, then connect a SATA 15-pin power cable from the PSU to the card's power input — this power step is frequently overlooked.

What maintenance or replacement will the SMUGDESK ASM3242 expansion card need later?

The card itself has no moving parts or scheduled maintenance; only the external SATA power cable or the USB-C port may need replacement if physically damaged after prolonged use.

What limit appears first on the SMUGDESK 20Gbps USB-C card under sustained heavy transfers?

The PCIe 3.0 x4 host link and the ASM3242 controller both cap throughput at 20Gbps, so sustained NVMe enclosure traffic will hit that bandwidth ceiling before any other bottleneck.

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