---
product_id: 759736202
title: "StarTech.com 1 Port USB-C 3.2 Gen 2x2 PCIe Card PEXUSB321C"
brand: "startech.com"
price: "¥1729135"
currency: JPY
in_stock: true
reviews_count: 5
category: "Star Tech.Com"
url: https://www.desertcart.jp/products/759736202-startech-com-1-port-usb-c-3-2-gen-2x2
store_origin: JP
region: Japan
---

# 20Gbps blazing USB-C speed UASP boosts storage performance PCIe 3.0 x4 full bandwidth StarTech.com 1 Port USB-C 3.2 Gen 2x2 PCIe Card PEXUSB321C

**Brand:** startech.com
**Price:** ¥1729135
**Availability:** ✅ In Stock

## Summary

> 🚀 Upgrade your desktop with the ultimate USB-C speed boost!

## Quick Answers

- **What is this?** StarTech.com 1 Port USB-C 3.2 Gen 2x2 PCIe Card PEXUSB321C by startech.com
- **How much does it cost?** ¥1729135 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/759736202-startech-com-1-port-usb-c-3-2-gen-2x2)

## Best For

- startech.com enthusiasts

## Why This Product

- Trusted startech.com brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Seamless Multi-Device Support:** Smart bandwidth management reduces lag when connecting multiple USB devices.
- • **Blazing Fast USB-C 3.2 Gen 2x2:** Experience ultra-high 20Gbps transfer speeds for next-level data flow.
- • **Compact Design with Dual Brackets:** Fits both standard and low-profile PCs, perfect for sleek professional workstations.
- • **Full PCIe 3.0 x4 Lane Utilization:** Unlock maximum bandwidth with true x4 PCIe slot support—no bottlenecks here.
- • **Plug & Play with Cross-Platform Compatibility:** Effortless installation with Windows, Linux, and macOS support—future-proof your setup.

## Overview

The StarTech.com PEXUSB321C is a high-performance PCIe expansion card delivering a single USB-C 3.2 Gen 2x2 port with blazing 20Gbps speeds. Powered by the ASMedia ASM3242 controller and leveraging PCIe 3.0 x4 lanes, it ensures full bandwidth for ultra-fast data transfers, ideal for NVMe SSDs and high-speed peripherals. Compatible across Windows, Linux, and macOS, it supports multiple USB standards and comes with both full and low-profile brackets for versatile installation.

## Description

desertcart.co.jp: StarTech.com 1 Port USB-C 3.2 Gen 2x2 PCIe Card PEXUSB321C : Computers

Review: ASMedia ASM3242 works really well! - I already have a USB C 3.2 Gen 2x2 20Gbps port on my motherboard (Aorus X570S Master), but I found out that the controller runs on a PCIe 3.0 x2 lane, which is not ideal. So I purchased this card thinking I will have two 20GBps port in total, and this being a PCIe 3.0 x4 controller, I'll get the full bandwidth. Installing the card was easy, it is tiny, and worked almost straightaway. I forgot that if I use the last PCIe slot, one of the M.2 slot will be disabled. So I had to move the M.2 SSD from the slot that shares the PCIe lane with the x4 slot to another M.2 slot. Restarted the PC, windows automatically installed the driver needed. Just as I thought, the card works faster than the built-in one, since it got the full x4 lane. It might work even better if I install it in the 2nd 16X slot, but I have a RAID controller installed there so couldn't do that. There was a nice 400MB/s bump, and the Acer Predator 4TB SSD installed in a Yottamaster 20GBps NVMe enclosure reached 2000MB/s on both read/write, which is sweet! Now I have 4 SSDs which can do my backups very very fast. A great card, works very well, and a no hassle installation. Just give it a slot where it can use PCIe 3.0 x4 lanes, and you are good to go. Also, a good 20GBps cable is recommended.
Review: 2000 MB/s no problem with external T9 Ssd - 2000 MB/s no problem with T9 ssd .. Windows file manager obviously a bit slower but ive still seen 1.7 from that ..

## Features

- High Performance: USB 3.2 Gen 2x2 PCIe card with 1 USB-C SuperSpeed 20Gbps port on your desktop PC. Power devices up to 15W (5V @ 3A)
- USB 3.2 Gen 2x2 Full Speed Supported: Equipped with ASMedia ASM3242 host controller. Supports PCIe 3.0 x4 slot PCI Express USB-C expansion card supports transfer speeds of up to 20Gbps, allowing fast access to high-performance devices such as NVMe drives and SSDs
- Excellent USB Performance: Supports Multiple IN and reduces bandwidth loss when connecting multiple devices with different speeds (hub side must also support this function) UASP support improves performance for storage devices
- Compatibility: Add-on card that can be installed in PCIe 3.0 x4 slot (supports both standard and low profile) / Brackets included, backwards compatible with PCIe 2.0 / Windows Linux macOS support window 8 and above for driver installation / Supports USB 3.1/3.0/2.0 devices, NOT support USB C video transmission (DP-Alt mode)
- StarTech.com Advantage: IT Professional products for over 35 years. Free and inquiries or consultations from the manufacturer

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08T6FCF9S |
| Amazon Bestseller | #170,654 in Computers ( See Top 100 in Computers ) #623 in Network I/O Port Cards |
| Brand | StarTech.com |
| Built-In Media | 1x PCI Express USB Card, 1x Full Profile Bracket (installed), 1x Low Profile Bracket, 1x Quick Start Guide |
| Compatible Devices | PC Laptop |
| Customer Reviews | 4.5 out of 5 stars 225 Your Review |
| Hardware Interface | PCI Express x4 |
| Item Dimensions L x W x H | 5.1L x 7.9W x 2.3H cm |
| Item Height | 0.9 inches |
| Item Weight | 0.08 Pounds |
| Manufacturer | StarTech.com |
| Model Number | PEXUSB321C |
| Operating System | Linux,Windows |
| Product Dimensions | 5.1L x 7.9W x 2.3H cm |
| Style | Modern |
| Style Name | Modern |
| UPC | 065030891264 |

## Product Details

- **Brand:** StarTech.com(スターテック)
- **Hardware Interface:** PCI Express x4
- **Product Dimensions:** 5.1L x 7.9W x 2.3H cm
- **Style:** Modern
- **Item Weight:** 0.08 Pounds

## Images

![StarTech.com 1 Port USB-C 3.2 Gen 2x2 PCIe Card PEXUSB321C - Image 1](https://m.media-amazon.com/images/I/61QpXvxSFGL.jpg)
![StarTech.com 1 Port USB-C 3.2 Gen 2x2 PCIe Card PEXUSB321C - Image 2](https://m.media-amazon.com/images/I/61e7msVSRHL.jpg)
![StarTech.com 1 Port USB-C 3.2 Gen 2x2 PCIe Card PEXUSB321C - Image 3](https://m.media-amazon.com/images/I/71D+TUel4TL.jpg)
![StarTech.com 1 Port USB-C 3.2 Gen 2x2 PCIe Card PEXUSB321C - Image 4](https://m.media-amazon.com/images/I/71pucpjwufL.jpg)
![StarTech.com 1 Port USB-C 3.2 Gen 2x2 PCIe Card PEXUSB321C - Image 5](https://m.media-amazon.com/images/I/81c4UKtqyjL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ ASMedia ASM3242 works really well!
*by M***. on January 24, 2024*

I already have a USB C 3.2 Gen 2x2 20Gbps port on my motherboard (Aorus X570S Master), but I found out that the controller runs on a PCIe 3.0 x2 lane, which is not ideal. So I purchased this card thinking I will have two 20GBps port in total, and this being a PCIe 3.0 x4 controller, I'll get the full bandwidth. Installing the card was easy, it is tiny, and worked almost straightaway. I forgot that if I use the last PCIe slot, one of the M.2 slot will be disabled. So I had to move the M.2 SSD from the slot that shares the PCIe lane with the x4 slot to another M.2 slot. Restarted the PC, windows automatically installed the driver needed. Just as I thought, the card works faster than the built-in one, since it got the full x4 lane. It might work even better if I install it in the 2nd 16X slot, but I have a RAID controller installed there so couldn't do that. There was a nice 400MB/s bump, and the Acer Predator 4TB SSD installed in a Yottamaster 20GBps NVMe enclosure reached 2000MB/s on both read/write, which is sweet! Now I have 4 SSDs which can do my backups very very fast. A great card, works very well, and a no hassle installation. Just give it a slot where it can use PCIe 3.0 x4 lanes, and you are good to go. Also, a good 20GBps cable is recommended.

### ⭐⭐⭐⭐⭐ 2000 MB/s no problem with external T9 Ssd
*by D***K on January 9, 2026*

2000 MB/s no problem with T9 ssd .. Windows file manager obviously a bit slower but ive still seen 1.7 from that ..

### ⭐⭐⭐⭐⭐ A GOOD QUALITY PRODUCT
*by G***Y on March 12, 2024*

I'm no expert in this area, i wanted an extra usb c output on my computer, as it only had one, and it was coping a hiding, and it seems to be doing the job OK

## Frequently Bought Together

- StarTech.com 1-Port USB 3.2 Gen 2x2 PCIe Card, USB-C 20Gbps PCI Express 3.0 x4 Adapter, Data Only, Windows/macOS/Linux, TAA
- StarTech.com 2-Port USB 3.2 Gen 2 PCIe Card, USB-C 10Gbps PCI Express 3.0 x4 Adapter, Data Only, Windows/macOS/Linux, TAA
- Cable Matters 20Gbps USB C to USB C Monitor Cable 6 ft / 1.8m, Supports Up to [8K@30Hz / 4K@120Hz Video, 240W Charging, 20Gbps Data Transfer], USB C Video Cable/USB C Display Cable with USB 3.2 Gen 2

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-20*