Product highlights:
- Provides two external USB 3.0 connections
- Supports data rates up to 5 Gbps
- Needs SATA power connector delivers up to 900mA per USB port
- Compliant with PCI Express 2.0 specifications
- Compliant with USB 3.0 rev 1.0
- Backward compatible with USB 2.0 and USB 1.0/1.1 devices
- Includes a low profile/half-height installation bracket
StarTech 2 Port PCIe USB 3.0 Card
The StarTech PEXUSB3S23 2-Port PCI Express USB 3.0 Card lets you add two USB 3.0 ports to any PCI Express-enabled computer system. The USB card requires SATA power for functionality and delivers 900mA of power per port to USB 3.0 bus-powered devices (500mA for USB 2.0) via your computer's SATA power connector.
Data Transfer Speeds
The PCIe USB 3.0 adapter is compliant with USB 3.0 standards for data transfer speeds up to 5 Gbps, while still offering backward compatibility with existing USB 2.0 / 1.1 devices.
Standard Profile Bracket and Low-Profile/Half-Height Bracket
For added versatility, the controller card is equipped with a standard profile bracket and includes a low-profile/half-height bracket for installation in small form-factor computers.
Ratings and reviews
StarTech 2 Port PCIe USB 3.0 Card 

StarTech 2 Port PCIe USB 3.0 Card
SKU: PEXUSB3S23