StarTech PEXUSB314A2V2 4-Port USB 3.2 Gen 2 PCIe Expansion Card

The StarTech PEXUSB314A2V2 is a PCI Express expansion card that adds four USB 3.2 Gen 2 Type-A ports to any compatible desktop or server, each capable of 10Gbps — the right pick when your workstation or NVR host is running out of high-speed USB bandwidth and you need more throughput than a standard USB 3.0 hub can deliver. Built around the ASMedia ASM3142 chipset and running on a PCIe 2.0 x4 slot, it delivers a 20Gbps shared aggregate bus — enough headroom to run multiple high-bandwidth peripherals simultaneously without bottlenecking on the interface.

Key Features

• 10Gbps Per Port (USB 3.2 Gen 2): Each of the four Type-A ports runs at up to 10Gbps independently — 10x faster than USB 2.0 and 2x faster than USB 3.1 Gen 1. If you're connecting high-resolution capture devices, fast external SSDs, or USB 3.2-capable industrial cameras, this throughput matters for sustained transfer rates rather than burst peaks.
• ASMedia ASM3142 Chipset: The ASM3142 is a proven, widely-supported controller with native driver support across Windows 7 and later, macOS 10.13 and later, and Linux kernel 3.5 and later. No proprietary driver packages to manage — this matters in enterprise environments where driver stability and OS compatibility documentation are part of the approval process.
• 20Gbps Total Shared Bandwidth via PCIe 2.0 x4: The card sits in a PCIe 2.0 x4 slot delivering 20Gbps of aggregate bus bandwidth. Running all four ports simultaneously under heavy load means ports share that 20Gbps ceiling — plan accordingly if you're attaching four high-throughput devices concurrently. For typical mixed-use scenarios (one or two active high-speed devices), this is a non-issue.
• 4.5W Power Output Per Port: Each port delivers up to 4.5W of bus power, which covers most USB-powered accessories including external drives and industrial sensors without needing a separate powered hub. This is slightly below the 7.5W of USB 3.2 Gen 2 fast-charging spec, so battery-charging use cases at full rate aren't the target application here.
• Internal SATA Power Connector: The card includes a single internal SATA power connector. This draws supplemental power from your system's PSU rather than taxing the PCIe slot's 25W limit — important when all four ports are under load simultaneously and you need consistent power delivery to connected devices.
• Standard Profile Form Factor: At 5.9 in × 4.7 in × 0.7 in and 3.0 oz, the PEXUSB314A2V2 fits standard ATX and mini-tower cases without issue. The low weight and compact PCB make it straightforward to deploy in rack-mounted workstations and compact server chassis.
• UASP Support (USB Attached SCSI Protocol Rev. 1.0): UASP reduces CPU overhead and improves throughput for compatible storage devices — particularly relevant when connecting NAS adapters, docking stations, or high-speed SSDs. UASP-capable drives will perform noticeably faster than in BOT (Bulk-Only Transfer) mode.
• Broad OS Support Without Extra Configuration: Windows 7+, macOS 10.13+, and Linux 3.5+ are all natively supported. In surveillance and automation deployments running Linux-based NVR software or macOS-based editing workstations, plug-and-play operation without kernel module compilation is a real operational advantage.

Integration and Compatibility

The PEXUSB314A2V2 installs into any PCIe 2.0 or PCIe 3.0 x4 (or larger) slot — PCIe is backward and forward compatible at the physical and electrical level, so a PCIe 3.0 x4 slot will accept this card and operate at PCIe 2.0 x4 speeds. Verify your motherboard or server has an available x4, x8, or x16 physical slot before ordering. The SATA power connector requires a free SATA power lead from your system PSU — in builds with many drives, confirm a spare connector is available.

For network video recorders and surveillance workstations that need to attach multiple USB-based capture interfaces, transfer devices, or enrollment readers, this card provides the dedicated high-speed USB fabric that motherboard ports often can't deliver at scale. Pair it with a StarTech expansion and connectivity products for a consistent vendor ecosystem when specifying server upgrades.

Security integrators building Windows-based network-attached storage or switching infrastructure who also run USB-attached peripherals (enrollment tablets, USB backup drives, hardware security keys) will find the four discrete 10Gbps ports more practical than a single hub cascading off one motherboard port. For guidance on building out a complete surveillance infrastructure, see the surveillance camera and system buying guide for context on host platform requirements.

Frequently Asked Questions

Q: Does the PEXUSB314A2V2 work in a PCIe 3.0 x4 slot?

A: Yes. PCIe is backward compatible — the card will install and operate in any PCIe x4, x8, or x16 slot running at PCIe 2.0 or 3.0 speeds. The card itself is specified at PCIe 2.0 x4, so it will run at PCIe 2.0 x4 speeds regardless of slot generation.

Q: Is the 10Gbps per port or shared across all four ports?

A: Each port is rated at up to 10Gbps independently, but the total bus bandwidth is 20Gbps shared across all four ports via the PCIe 2.0 x4 interface. Under simultaneous heavy load on all four ports, the aggregate 20Gbps ceiling applies.

Q: Does the PEXUSB314A2V2 require a SATA power connection?

A: The card includes an internal SATA power connector. Connecting it to your PSU is recommended to ensure stable 4.5W-per-port power delivery under full load. Without it, power delivery to all four active ports simultaneously may be constrained by the PCIe slot's power budget.

Q: What operating systems are supported?

A: Windows 7 and later, macOS 10.13 and later, and Linux kernel 3.5 and later are all supported natively via the ASMedia ASM3142 chipset. No additional driver installation is required on most modern OS versions.

Q: Does this card support USB 2.0 devices?

A: Yes. The card is backward compatible with USB 2.0 devices per the USB 2.0 industry standard it supports. USB 2.0 devices will operate at USB 2.0 speeds when connected to the card's Type-A ports.

Q: What is the operating temperature range for the PEXUSB314A2V2?

A: The card is rated for operating temperatures of 5°C to 50°C (41°F to 122°F), which covers standard server room and workstation environments. Storage temperature range is -20°C to 60°C.

Jerry Tildsen

The spec I pay attention to first on the PEXUSB314A2V2 is the 20Gbps shared bus ceiling against four 10Gbps ports — that ratio defines exactly where this card fits and where it doesn't. If you're running two or three active high-bandwidth devices with one or two lower-utilization ports, you'll never see the ceiling. If you're trying to simultaneously max out all four ports with fast SSDs or high-bitrate capture devices, the shared 20Gbps becomes the constraint, not the ports themselves.

Technical Highlights:

• ASMedia ASM3142 Chipset: Natively supported on Windows 7+, macOS 10.13+, and Linux 3.5+ — no unsigned driver packages, no kernel recompilation. In enterprise and government deployments where driver provenance is audited, this matters more than the spec sheet suggests.
• 4.5W Per Port Power Output: Enough to power most USB-attached industrial peripherals, enrollment readers, and external drives without a hub. Not a fast-charging card — if a connected device demands USB Power Delivery at higher wattages, it won't get it here.
• SATA Power Input: Drawing supplemental power from the PSU rather than the PCIe slot keeps all four ports stable under concurrent load. Skip connecting the SATA lead and you're gambling on the slot's 25W budget covering everything — connect it and the power path is defined.

Deployment Considerations:

• Verify your chassis has a free PCIe x4 (or larger) physical slot and a spare SATA power lead from the PSU before specifying this card. Both are required for full-rated operation.
• The 5°C to 50°C operating temperature range means this card is appropriate for conditioned server rooms and workstation environments — it is not rated for industrial enclosures or outdoor edge compute boxes that see temperature extremes.

This card fits best in surveillance workstations and NVR host machines running Windows or Linux where the motherboard's native USB ports are saturated and you need four clean, high-speed USB 3.2 Gen 2 paths for enrollment devices, USB-attached backup targets, or capture peripherals — all without adding a hub cascade that degrades throughput.