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Green circuit board with four blue USB ports and a metal bracket

STARTECH

STARTECH PEXUSB3S42V 4-Port USB 3.0 PCIe Expansion Card

SKU CH-36SV-7MTR3 MPN PEXUSB3S42V

Adds four USB 3.0 ports with quad-bus architecture delivering 20 Gbps total bandwidth and SATA power for charging

  • TypePCI Express
  • SpecificationsIndustry Standards: - USB 3.0 Specification Rev. 1.0 - USB B
  • FeaturesAdd 4 SuperSpeed USB 3.0 ports with Quad Bus architecture (5
  • Dimensions0.59" x 2.17" x 6.57" (W x H x L)
  • Weight0.13lb

External USB Ports 4 Ext Dual Bus

Struck-through versions exist but are not stocked here.

  • Add four SuperSpeed USB 3.0 ports with quad bus architecture to a PCI Express-enabled PC
  • Two independent 5 Gbps channels deliver up to 20 Gbps total bandwidth for high-throughput devices
  • USB Battery Charging 1.2 in Apple Mode powers compatible phones and tablets while connected
  • Low-profile and SATA power options fit compact cases and reduce load on the motherboard
  • Verified compatibility with HP Pro 4300 and Dell OptiPlex 3010 for drop-in upgrades

Four USB 3.0 ports for PCIe desktops

The STARTECH PEXUSB3S42V adds four SuperSpeed USB 3.0 ports to a desktop computer through a PCI Express slot. It targets users who need extra high-speed connections for external drives or peripherals on a system that lacks sufficient native ports. Each port operates on its own channel for dedicated bandwidth. The card supports USB Battery Charging 1.2 in Apple mode only.

Low-profile bracket and SATA power

A low-profile bracket is included for small-form-factor chassis such as the HP Pro 4300 or Dell OptiPlex 3010. Power is drawn from an internal SATA connector so the board does not rely solely on the slot. Installation requires a free PCIe x1 or larger slot and an available SATA power lead from the power supply. Builders without a spare SATA connector or with only legacy PCI slots cannot use this card.

Sustained throughput with UASP

The quad-bus architecture provides up to 5 Gbps per port and 20 Gbps aggregate bandwidth. UASP support reduces protocol overhead so large file transfers maintain higher sustained speeds than bulk-endpoint-only controllers. The card complies with USB 3.0 Rev 1.0 and PCI Express 2.0 specifications. Thermal throttling is not a concern because the controller runs without active cooling under typical desktop workloads.

Highlights

  • Add four SuperSpeed USB 3.0 ports with quad bus architecture to a PCI Express-enabled PC
  • Two independent 5 Gbps channels deliver up to 20 Gbps total bandwidth for high-throughput devices
  • USB Battery Charging 1.2 in Apple Mode powers compatible phones and tablets while connected
  • Low-profile and SATA power options fit compact cases and reduce load on the motherboard
  • Verified compatibility with HP Pro 4300 and Dell OptiPlex 3010 for drop-in upgrades

Specifications

BrandStarTech.com
ModelPEXUSB3S42V
TypePCI Express
SpecificationsIndustry Standards:
- USB 3.0 Specification Rev. 1.0
- USB Battery Charging Specification Rev. 1.2 (Apple Mode only)
- PCI Express Base Specification Rev. 2.0
- Intel xHCI Specification Rev. 1.0
Interface: USB 3.0
Connector Type(s): 1 - PCI Express x4 Male
External Ports: 4 - USB 3.0 A (9 pin; SuperSpeed) Female
Internal Ports:
- 1 - LP4 (4 pin; Molex Large Drive Power) Female
- 1 - SATA Power (15 pin) Plug
Maximum Cable Length: 9.8 ft [3 m]
Maximum Data Transfer Rate: 5Gbps per 2 ports - 10Gbps Total
Type and Rate: USB 3.0 - 5 Gbit/s
UASP Support: Yes
FeaturesAdd 4 SuperSpeed USB 3.0 ports with Quad Bus architecture (5Gbps per port) to your PCI Express-enabled PC
Provides four external, quad bus USB 3.0 Ports
Supports up to 20 Gbps total transfer bandwidth - Up to 5 Gbps per port
UASP support across all four ports
PCIe x4 interface compliant with PCI Express 2.0 specifications
Optional LP4 or SATA power connector provides up to 900mA per USB port
Supports USB Battery Charging Specification 1.2 (Apple Mode only)
Fully compliant with USB 3.0 rev 1.0 and Intel xHCI rev 1.0 specifications
Backward compatible with USB 2.0 and USB 1.0/1.1 devic
Dimensions0.59" x 2.17" x 6.57" (W x H x L)
Weight0.13lb
Shipping weight0.20 kg
Package size208 × 142 × 41 mm

Other versions of this model

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Questions about this item

How can I verify the card is delivering 5 Gbps per port after installation?

Check the operating-system device manager to confirm each port links at SuperSpeed USB 3.0 and run a file transfer to a USB 3.0 drive; sustained throughput approaching the rated bandwidth indicates the quad-bus architecture is active.

What accessories are included and what must be sourced separately?

The card includes a low-profile bracket and SATA power cable; you supply the PCI Express x1 or larger slot and any USB 3.0 cables for your peripherals.

Should I choose this model over a single-channel USB 3.0 card?

Select the PEXUSB3S42V when you need four external ports backed by two independent 5 Gbps channels and SATA power for charging, rather than a single shared channel.

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