Sonnet Allegro USB-C 4-port PCIe Card - USB3C-4PM-E

The Sonnet Allegro USB-C 4-Port PCIe Card provides an efficient way to add four high-speed USB-C p...

Best current price£135.32from PCHUB.UK

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PCHUB.UKSonnet Allegro Interface Cards/Adapter Internal Usb 3.2 Gen 1 (3.1 Gen
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GamingKitSonnet Allegro Interface Cards/Adapter Internal Usb 3.2 Gen 1 (3.1 Gen
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Wex Photo VideoSonnet Allegro USB-C 4-Port PCIe Card - PCIe to USB 3.2 Gen 1
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Product Information

Full details

The Sonnet Allegro USB-C 4-Port PCIe Card is designed for power users, creative professionals, and desktop PC owners who need to expand their system's connectivity with high-speed USB-C ports. This card delivers a significant performance boost for external SSDs and peripherals by providing dedicated bandwidth and reliable power, though it requires an available PCIe slot and is not suitable for laptops lacking an external PCIe expansion chassis.

All features

Model Part NumberUSB3C-4PM-E
BrandSonnet

Extended Product Information

FAQs

Does this card require external power from the power supply?

No, the card draws its power directly from the PCIe bus to provide 7.5W per port.

Can I use this in a laptop?

Only if your laptop is connected to a compatible Thunderbolt-to-PCIe expansion chassis.

What is the maximum speed per port?

The ports support USB 3.2 Gen 1 speeds, and the total bandwidth shared across the card is 20 Gbit/s.

Is this card compatible with macOS?

Yes, it is designed for use in Mac Pro towers and Thunderbolt-to-PCIe expansion systems.

Do I need to install special drivers?

In most modern Windows, Mac, and Linux environments, the card is natively supported via plug-and-play.

Troubleshooting

Device is not recognized when plugged into the card.

Check that the card is fully seated in the PCIe slot and the system drivers are up to date.

Bus-powered drives disconnect under heavy load.

Ensure the device does not exceed the 7.5W power limit per port and try using a different USB-C cable.

Pros and Cons

Pros

  • Significantly faster data transfer speeds compared to standard USB 3.0 cards
  • Provides adequate power for multiple bus-powered SSDs simultaneously
  • Easy to install in any standard PCIe slot
  • Eliminates performance bottlenecks caused by legacy motherboard USB controllers

Cons

  • Not compatible with laptops unless using an external PCIe expansion enclosure
  • Requires an open internal PCIe slot
  • Limited to desktop computer or enterprise rack-mount use cases

Setup, Compatibility & Care

To install the card, ensure your computer is powered off and unplugged. Insert the card into an available x4 or larger PCIe slot on your motherboard. Once installed and the system is booted, the card is generally plug-and-play on most modern operating systems. To maintain optimal performance, ensure your PCIe slot is free of dust and verify that your system BIOS is updated to support PCIe expansion cards. Avoid plugging the card into PCIe x1 slots if you require the maximum bandwidth capabilities of all four ports simultaneously, as the shared lane speed may be limited.

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