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Green circuit board with silver PCIe connector and single USB-C port on metal bracket

STARTECH

STARTECH PEXUSB321C 1-Port USB 3.2 Gen 2x2 PCIe Expansion Card

SKU CH-YTBC-K6FD6 MPN PEXUSB321C

Adds a USB-C port delivering 20Gbps over a PCIe 3.0 x4 slot with UASP support for NVMe drives

  • External USB portsUSB Type-C (24 pin, Gen 2 × 2, 20 Gbit/s)
  • Supported standardsUSB 3.2 Specification Rev. 1.0 PCI Express Base Specificatio
  • Transfer speed20 Gbit/s
  • Supported operating systemsWindows 8, 8.1, 10 Windows Server 2012 R2, 2016, 2019 macOS
  • Product typePCI Express to USB Card
  • Compatible withPCI Express enabled computer or server with a PCI Express x4
  • Add a 20Gbps USB-C port with USB 3.2 Gen 2x2
  • ASMedia ASM3242 controller handles mixed-speed devices efficiently
  • UASP support speeds up external NVMe storage
  • Fits full-height or low-profile PCIe 3.0 x4 slots
  • Works on Windows, macOS and Linux without extra drivers

Single-port USB 3.2 Gen 2x2 PCIe card

The StarTech PEXUSB321C adds one USB Type-C port with 20Gbps bandwidth to a desktop or server. It installs in a PCI Express 3.0 x4 slot and uses the ASMedia ASM3242 host controller. Windows, Linux and macOS are supported with automatic driver loading on Windows 8 and later. The card includes both full-height and low-profile brackets.

Builders needing one 20Gbps USB-C data port

Suits users who want a single high-speed USB-C connection for external SSDs, NVMe enclosures or other Gen 2x2 devices. UASP support improves storage throughput on compatible drives. Not for systems lacking a PCIe x4 or larger slot, nor for anyone requiring DisplayPort Alt Mode or USB Power Delivery charging. The port delivers up to 15W of power for bus-powered peripherals only.

Requires PCIe 3.0 x4 for full 20Gbps speed

The card’s maximum throughput is limited by the host bus interface. PCI Express Gen 1 slots cap bandwidth at 10Gbps, while Gen 2 or Gen 3 x4 links are needed to reach the rated 20Gbps. Verify the motherboard or riser provides at least a Gen 2 x4 connection before purchase.

How it compares

Measured against everything we stock in PCIe Expansion Cards, at today’s prices. Recalculated every night.

Price $46.99
Pricier than about 68% of the 891 comparable items (median $30.99).

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Specifications

Product
Brand nameStarTech.com
Model namePEXUSB321C
Product typePCI Express to USB Card
Performance
Transfer speed20 Gbit/s
Connectivity
Supported standardsUSB 3.2 Specification Rev. 1.0
PCI Express Base Specification Rev. 3.0
Intel xHCI Specification Rev. 1.1
UASP (USB Attached SCSI Protocol) Rev. 1.0
Ports & slots
External USB portsUSB Type-C (24 pin, Gen 2 × 2, 20 Gbit/s)
Size & build
Product dimensions0.9 in × 3.1 in × 2.0 in
Product weight1.3 oz
Shipping weight0.10 kg
Package size170 × 142 × 30 mm
Compatibility
Supported operating systemsWindows 8, 8.1, 10
Windows Server 2012 R2, 2016, 2019
macOS 10.13 to 10.15, 11.0
Linux 3.5 or later LTS version only
In the box
In the boxPCI Express USB Card
Full Profile Bracket (Installed)
Low Profile Bracket
Quick-Start Guide

Questions about this item

Does the card include a low-profile bracket or only the full-size one?

Both brackets are supplied; the full-profile bracket comes pre-installed and the low-profile bracket is included for slim chassis.

Which PCI Express generation is needed to reach the 20Gbps headline speed?

A PCIe 2.0 or 3.0 x4 slot is required; a PCIe 1.0 slot caps throughput at 10Gbps.

Can the single USB-C port deliver the full 20Gbps when an NVMe enclosure is attached?

Yes, the ASMedia ASM3242 controller supports Multiple INs so mixed-speed devices share the 20Gbps bandwidth without bottlenecking the NVMe drive.

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