here!
I’m your shopping assistant for PC builds, upgrades, and everything tech.
Got questions? Ask away!
Start a conversation
Best Sellers
Top Rated- $66.06
- + FREE SHIPPING
Hot Seller- $71.92
- + FREE SHIPPING
StarTech.com PEXUSB321C 1-Port USB 3.2 Gen 2x2 PCIe Card - USB-C SuperSpeed 20Gbps PCI Express 3.0 x4 Host Controller Card - USB Type-C PCIe Add-On Adapter Card - Expansion Card - Windows & Linux (PEXUSB321C)
- USB 3.2 Gen 2x2 PCIe card has 1x USB Type-C port supporting SuperSpeed 20Gbps
- Host controller card with ASMedia ASM3242
- USB-C PCI Express expansion card supports Multiple INs for max bandwidth w/mixed-speed devices
- Adapter card w/UASP support optimizes USB performance w/ SSDs/HDDs/NVMe drives
- Up to 15W of power
- Install add-on card in full or low-profile PCI-e 3.0 x4 slot
- Win/Linux/macOS w/auto drivers on Windows 8 and up
- Supports all older USB 3.1/3.0/2.0 devices
+
+
Overview
Specs
Reviews
See all Q & A 
Any questions? Ask CelesteSM will help you find out quickly.
Try me now
Warranty & Returns
Warranty, Returns, And Additional Information
Warranty
- Limited Warranty period (parts): 1 year
- Limited Warranty period (labor): 1 year
- Read full details
Return Policies
- Return for refund until: January 31, 2027
- Return for replacement until: January 31, 2027
- This item is covered by Newegg.com's Extended Holiday Return Policy.
- Read full return policy for details.
We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1st, 2026 and December 31, 2026 you will have until January 31, 2027 to return your product.
Manufacturer Contact Info
- Manufacturer Product Page
- Manufacturer Website
- Support Phone: 1-800-265-1844
- Support Email: support@startech.com
- Support Website
- View other products from STARTECH
LOADING...
LOADING...
The StarTech.com PEXUSB321C is a PCIe expansion card that adds one USB-C port with up to 20Gbps USB 3.2 Gen 2x2 data speeds, suited to desktop or server users connecting high-speed external SSDs and other storage devices; full speed requires a PCIe Gen 2 or Gen 3 slot.
Recommended For
- Desktop users who regularly move large files to or from a USB 3.2 Gen 2x2 external SSD or NVMe enclosure and have an available PCIe x4-or-larger slot. The card adds a 20Gbps USB-C data port for that storage workflow.
- PC builders whose motherboard lacks a USB 20Gbps port but who want to add one for a compatible external SSD or drive enclosure, rather than replace the motherboard.
- Desktop users who need one rear USB-C port for fast external storage and can install an add-in card; the included low-profile bracket also suits compatible small-form-factor PCs.
- Users with a compatible USB-C phone or other peripheral who want a desktop port for data syncing or modest device charging, within the card’s stated 15W power limit.
Spec Summary
| Attribute | Value |
|---|---|
| Best For | Adding a single high-speed USB-C data port to a PCIe-equipped computer or server, including for USB storage devices |
| USB Port And Data Rate | One USB Type-C port supporting USB 3.2 Gen 2x2 data transfer up to 20Gbps; compatible with older USB 3.1, 3.0, and 2.0 devices |
| PCIe Interface And Compatibility | PCI Express x4 card for an x4 or higher slot; PCIe Gen 2 or Gen 3 is required to reach up to 20Gbps, while Gen 1 limits throughput to 10Gbps |
| Controller And Protocols | ASMedia ASM3242 host controller with UASP support; supports Multiple INs for mixed-speed USB devices |
| Power And Display Support | Provides up to 15W; USB-C port supports data only and does not support DisplayPort Alt Mode or USB Power Delivery |
| Operating System Support | Windows 8, 8.1, and 10; Windows Server 2012 R2, 2016, and 2019; macOS 10.13–10.15 and 11.0; Linux 3.5 or later LTS |
| Card Profile And Dimensions | Standard-profile card with a low-profile bracket included; measures 3.1 × 2.0 × 0.9 inches and weighs approximately 1.3 oz |
| Model Identifiers | StarTech.com PEXUSB321C |