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Sonnet Allegro USB-C 4-Port PCIe Card
Sonnet

Allegro USB-C 4-Port PCIe Card

By SpecPicks Editorial · Verified 2026-08-21

$149.99
Buy on Amazon — $149.99 Compare to similar expansion cards

*Price sourced from Amazon.com. Last updated 2026-08-21. Price and availability subject to change.

Bottom line: The Allegro USB-C 4-Port PCIe Card is a niche pick — read recent reviews before buying in the expansion cards category, priced around $149.99. Read recent reviews carefully before committing.

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SpecPicks Verdict

SpecPicks classifies Sonnet Allegro USB-C 4-Port PCIe Card as a niche pick — read recent reviews before buying in the expansion cards category, based on our editorial and benchmark analysis and our ranking model that weights rating × review-volume × price-fit. Sonnet's positioning sits within the broader category mid-tier. Use the Compare tool to put it side-by-side with two or three close alternatives before clicking through to Amazon.

Common buyer scenarios for expansion cards of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.

Pros & Cons

Pros

  • ✓ Powered Ports – Supports USB-C bus-powered SSD or SSD RAID with up to 7.5W per port
  • ✓ Backed by Sonnet's warranty and support channels
  • ✓ Ships via Amazon with Prime eligibility and the standard returns policy

Cons

  • ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
  • ✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified

Key Features

  • 4-Port USB 3.2 Gen2 – Adds four 10Gbps USB-C ports (not Thunderbolt) to your Mac Pro or Windows PC with PCIe slots
  • Dual USB 3.2 Gen 2 Controllers – Support data transfers at up to twice as fast as USB 3 Gen 1
  • Powered Ports – Supports USB-C bus-powered SSD or SSD RAID with up to 7.5W per port
  • Protected Power Delivery – Independent per-port power regulation isolates each port to prevent cross-coupled power glitches that may cause accidental disconnects
  • Mac, Windows 11+, and Linux Compatible

Full Specifications

BrandSonnet
StyleClassic
Style NameClassic
Unit Count1.0 Count
ConnectivityUSB-C
Model NumberUSB3C-4PM-E
CompatibilityPC, Mac, Linux
Built-In MediaSonnet Allegro USB-C 4-Port USB 3.1 Gen 2 PCIe Card with Dual 10Gb Controllers,
Mfr Part NumberUSB3C-4PM-E
Compatible DevicesPersonal Computer
Hardware InterfacePCI Express x4
Warranty Description1 Year Limited Warranty
Global Trade Identification Number00732311012648

Ready to buy?

Sonnet Allegro USB-C 4-Port PCIe Card is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Check price on Amazon →

*Price sourced from Amazon.com. Last updated 2026-08-21. Price and availability subject to change.

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Sonnet Allegro USB-C 4-Port PCIe Card
$149.99
View on Amazon →