StarTech.com
StarTech.com StarTech 1-Port USB 20Gbps PCIe Card
Bottom line: The StarTech.com StarTech 1-Port USB 20Gbps PCIe Card ($55.99 on Amazon as of 2026-10-06): ASMedia ASM3242 controller delivers full 20Gbps USB 3.2 Gen 2x2 speeds; main trade-off: single USB-C port only, so no Type-A or multi-port expansion.
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*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
Pros & Cons
Pros
- ✓ ASMedia ASM3242 controller delivers full 20Gbps USB 3.2 Gen 2x2 speeds
- ✓ Uses PCIe 3.0 x4 lanes, backward compatible with PCIe 2.0 slots
- ✓ Supplies 15W (5V/3A) to charge phones and bus-powered SSDs
- ✓ Low-profile bracket included for SFF and 2U chassis builds
- ✓ Driverless on Windows 8+, macOS and Linux; UASP for faster drive access
Cons
- ✗ Single USB-C port only, so no Type-A or multi-port expansion
- ✗ No DisplayPort Alt Mode, so it cannot drive a monitor over USB-C
- ✗ Data only, so no Power Delivery negotiation beyond 15W
- ✗ Requires a free PCIe x4 slot, ruling out laptops and most mini PCs
Manufacturer description
This PCIe USB 3.2 Gen 2x2 controller card installs into an available PCI-Express x4 slot in your computer and enables you to upgrade your current system by adding a USB-C (20Gbps) port. The controller card enables you to connect USB-C Gen 2x2 (20 Gbps) devices to your desktop computer. The USB-C port is ideal for connecting USB devices such as external hard drives and solid state drives or charging and syncing your mobile devices. The USB-C port provides up to 15W (5V/3A) of power and is backward compatible with USB 3.2 Gen 2 (10 Gbps) and USB 3.2 Gen 1 (5 Gbps) devices. Note: USB 3.2 Gen 2…
SpecPicks Verdict
SpecPicks scored StarTech.com StarTech 1-Port USB 20Gbps PCIe Card using a rating × review-volume × price-fit model applied to published specs and reviews across the expansion cards category. StarTech.com's expansion cards lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for expansion cards of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Key Features
- HIGH PERFORMANCE: Add 1x USB-C SuperSpeed 20Gbps port to your desktop PC with this USB 3.2 Gen 2x2 PCIe Card; Expansion card provides up to 15W (5V @ 3A) to power & charge devices
- FULL USB 3.2 GEN 2X2 SPEEDS: Featuring the ASMedia ASM3242 host controller using x4 lanes of PCIe 3.0, this card is fully capable of speeds up to 20Gbps enabling fast access to high-performance devices like NVMe drives and SSDs
- MAXIMIZED USB PERFORMANCE: USB Type-C PCI Express card supports Multiple INs to reduce bandwidth loss when mix speed devices are connected to a Hub (hub must also support this feature); UASP support improves performance with storage devices
- COMPATIBILITY: Add-on card installs in full or low-profile (bracket incl) PCIe 3.0 x4 slot (Backward compatible w/PCIe 2.0); Windows/Linux/macOS w/auto drivers Win 8 & up; Works w/USB 3.1/3.0/2.0 devices; Does not support DP-Alt mode for video over USB-C
Full Specifications
| Brand | StarTech.com |
|---|---|
| Style | Classic |
| Style Name | Classic |
| Unit Count | 1 Count |
| Connectivity | USB-C |
| Model Number | PEXUSB321C |
| Compatibility | PC, Mac, Linux |
| Built-In Media | "PCI Express USB Card Full Profile Bracket (Installed) Low Profile Bracket Quick-Start Guide" |
| Mfr Part Number | PEXUSB321C |
| Compatible Devices | Personal Computer, Laptop |
| Hardware Interface | PCI Express x4 |
| Warranty Description | 2 Year Warranty |
| Item Dimensions L x W x H | 2"L x 3.1"W x 0.9"H |
| Full listing title | StarTech 1-Port USB 20Gbps PCIe Card, TAA, Windows/macOS/Linux (PEXUSB321C) | USB-C 20Gbps PCI Express 3.0 x 4 Adapter, Data Only, 2x2 |
Ready to buy?
StarTech 1-Port USB 20Gbps PCIe Card, TAA, Windows/macOS/Linux (PEXUSB321C) | USB-C 20Gbps PCI Express 3.0 x 4 Adapter, Data Only, 2x2 is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
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