StarTech PEXUSB3S23 2-Port USB 3.0 PCIe Expansion Card

Overview

The StarTech PEXUSB3S23 is a standard-profile PCI Express expansion card that adds two USB 3.2 Gen 1 (5Gbps) Type-A ports to any desktop with an available PCIe slot. If you're running a surveillance workstation, NVR build, or access control server that's short on USB bandwidth — or simply out of rear-panel USB 3.0 ports — this card drops in without drama. It draws auxiliary power from an internal SATA connector, which means the ports can deliver up to 900mA each regardless of what the PCIe slot itself can supply. The Etron EJ168A chipset has broad driver support across Windows and Linux environments, making it a practical fit for commercial integrations without exotic software dependencies.

Key Features

• USB 3.2 Gen 1 at 5Gbps per port: Each of the two Type-A ports transfers at up to 5 Gbit/s — roughly ten times the throughput of USB 2.0. That's meaningful when offloading recorded footage from a USB 3.0 storage device or connecting a high-speed card reader to a security workstation where transfer time matters during incident review.
• 900mA power output per port: The PEXUSB3S23 taps a 15-pin SATA power connector on the motherboard to guarantee up to 900mA at each port. Devices that USB 2.0 ports couldn't reliably power — including bus-powered portable drives and some access card enrollment readers — will operate without dropped connections or under-voltage warnings.
• Etron EJ168A chipset: This chipset carries wide OS-level driver support. In Windows 10/11 environments it typically enumerates without a manual driver install. For Linux-based NVR appliances or custom surveillance builds, the EJ168A has established kernel support, reducing commissioning friction.
• Standard-profile form factor, 3.1 × 4.7 in: At 3.1 inches long and 4.7 inches tall, the card fits standard ATX and micro-ATX cases. It is not a low-profile card — verify your chassis bracket clearance before ordering if you're working with a slim desktop or 1U rackmount enclosure.
• Single PCIe slot, minimal footprint: Occupies one PCIe lane (x1 electrical), leaving the rest of your expansion slots free for capture cards, additional NICs, or storage controllers — relevant in dense surveillance server builds where slot real estate is limited.
• Ports integrated on card, max cable run 3 m (9.8 ft): Both USB Type-A receptacles are flush-mounted on the card's rear bracket. USB 3.0 cable runs are specified up to 3 meters — plan your peripheral placement accordingly if connecting devices at the back of a rack or across a workstation desk.
• Operating range 0°C to 60°C: Rated for commercial ambient temperatures up to 60°C, which covers most indoor equipment rooms, server closets, and workstation environments without derating concerns. Not rated for outdoor or uncontrolled enclosures.
• Lightweight at 43g: At 1.5 oz the card adds negligible mechanical load to the PCIe slot — no bracket reinforcement needed, and handling during installation is straightforward.

Integration and Compatibility

The PEXUSB3S23 is compatible with any system running a PCI Express slot of x1 or larger (x4, x8, x16 slots are electrically compatible at x1 speeds). It requires one available 15-pin SATA power connector from the system's PSU — confirm your power supply has a free SATA power lead before installation, particularly in older builds with limited cable count. The card supports StarTech's broad line of USB peripherals and pairs naturally with USB 3.0 storage devices, enrollment readers, and PCIe expansion cards used in commercial security installations. For integrators building out a surveillance workstation or access control enrollment station, this card resolves port-count limitations without requiring a new motherboard or system replacement. Consult your PCIe expansion card compatibility matrix for your specific motherboard if you're uncertain about slot availability. A USB cable selection guide can help you plan runs within the 3-meter USB 3.0 specification limit.

Frequently Asked Questions

Q: Does the PEXUSB3S23 require a separate power connection, or does it draw power from the PCIe slot alone?

A: It requires a 15-pin SATA power connector from your system's power supply. This connection is what enables 900mA output per port. The PCIe slot alone does not supply sufficient power for high-current USB 3.0 devices.

Q: Will the PEXUSB3S23 fit in a low-profile or slim desktop chassis?

A: No. The PEXUSB3S23 is a standard-profile card at 4.7 inches tall. It will not fit in low-profile or slim-line enclosures without a low-profile bracket, which is not confirmed as included. Verify your chassis bracket clearance before purchasing.

Q: What is the maximum USB cable length supported?

A: USB 3.0 specification supports a maximum cable run of 3 meters (9.8 ft) from the card's Type-A ports. Longer runs may result in signal degradation or device enumeration failures.

Q: What chipset does the PEXUSB3S23 use, and does it need a driver install?

A: The card uses the Etron EJ168A chipset, which has broad native driver support in Windows 10, Windows 11, and mainstream Linux kernels. Most systems will detect the card without a manual driver installation, though driver availability should be confirmed for specialized or embedded OS builds.

Q: What is the warranty on the PEXUSB3S23?

A: StarTech provides a 2-year manufacturer warranty on the PEXUSB3S23.

Q: Can this card be used in a PCIe x4 or x16 slot?

A: Yes. The card is electrically x1 but is physically compatible with x4, x8, and x16 PCIe slots, which will operate it at x1 speeds. This is standard PCIe backward compatibility.

James Everett

The PEXUSB3S23 comes up regularly when I'm spec'ing out access control enrollment stations or surveillance workstations where the stock rear-panel USB ports are already claimed — typically by a keyboard, mouse, and a locally-attached storage device for evidence export. The card's 900mA-per-port output via the SATA power tap is the detail that matters most: it means you can connect bus-powered peripherals that a standard 500mA USB 2.0 port would brown out under load.

Technical Highlights:

• 5Gbps per port (USB 3.2 Gen 1): Ten times the bandwidth of USB 2.0 — when you're pulling a multi-gigabyte video clip off a portable drive during an incident review, the difference between 480Mbps and 5Gbps is measurable in minutes, not seconds.
• Etron EJ168A chipset: Broad native OS support means this card enumerates cleanly in Windows 10/11 and mainstream Linux kernels without hunting for drivers — a real time-saver during rapid deployment across multiple workstations.
• Standard profile, 3.1 × 4.7 in, 43g: Fits any ATX or micro-ATX build without mechanical concerns, but confirm before ordering — this is not a low-profile card and won't seat in slim or SFF enclosures without a bracket swap.

Deployment Considerations:

• Confirm your PSU has a free 15-pin SATA power connector before installation — this is the only power source for the card's high-current output, and older or compact PSUs with limited cabling can catch you off guard.
• Keep peripheral cable runs within the 3-meter (9.8 ft) USB 3.0 spec limit. Beyond that, signal integrity degrades and device enumeration becomes unreliable — particularly relevant when mounting a workstation inside a rack and routing cables to a nearby desk.

The PEXUSB3S23 is the right call for a commercial surveillance workstation or access control enrollment station running short on USB 3.0 ports — specifically where bus-powered peripheral reliability at 900mA per port and clean OS-level driver support are non-negotiable.