StarTech.com PEXUSB312A3 · USB PCIe host card

MPN / P/N

PEXUSB312A3

Manufacturer designation

2-Port USB PCIe Card with 10Gbps/port - USB 3.2 Gen 2 Type-A PCI Express 3.0 x4 Host Controller Expansion Card - Add-On Adapter Card - Full/Low Profile - Windows & Linux

System and cable requirements

PCI Express enabled computer or server with a PCI Express x4; slot or higher (x8, x16); Optional SATA power connector; The maximum throughput of this card is limited by the bus interface. PCI Express Gen 1.0 max throughput is 2.5Gbps. PCI; Express Gen 2.0 and Gen 3.0 max throughput is 10Gbps

Colour

Black

Product length

3.9 in [100.0 mm]

Product width

4.7 in [12.0 cm]

Product height

0.7 in [19.0 mm]

Product weight

2.3 oz [65.0 g]

Operating temperature

5C to 50C (41F to 122F)

Storage temperature

-20C to 60C (-4F to 140F)

Humidity

20%~80% RH

USB power — documented scope

4.5W (5V @ 0.9A) nominal, per port - Current draw above 2.0A; (10W) will initiate Over-Current Protection

Maximum documented data rate

10Gbps

Type and rate

USB 10Gbps

UASP support

Yes

Number of ports

2

Interface

PCI Express x4

Bus type

PCI Express

Card profile

Standard Profile (LP bracket incl.)

Port Style

Integrated on Card

Industry standards

USB 3.2 Specification; PCI Express Base Specification Rev. 3.0; Intel xHCI Specification Rev. 1.1; UASP (USB Attached SCSI Protocol) Rev. 1.0

Chipset ID

ASMedia - ASM3142

Connector 1 (Quantity)

1

Connector 1

PCI Express x4

Connector 2 (Quantity)

2

Connector 2

USB-A (10Gbps, 4.5W)

Connector 3 (Quantity)

1

Connector 3

SATA (15-Pin)

Documented selection limits

Match the exact host interface, peripheral/device protocol, connector, firmware, OS/driver and power requirements before ordering. Published maximum rates are interface limits, not guaranteed application throughput. No universal device or current/future OS compatibility is implied. This is a PCI Express USB host-controller card, not an external USB hub. Match electrical PCIe generation/lane width and physical slot/profile. Per-port and aggregate bandwidth/power depend on the controller topology and auxiliary power. USB-C ports do not imply USB Power Delivery or display output.

Specification source: StarTech.com ↗
Checked against documentation: 16.10.2026