Technical Specifications

Mac, Windows, and Linux Logos


Mac Compatibility

  • Mac Pro 14,8 (2023)
  • macOS Ventura (not compatible with Sonoma initial release)(2)
  • Mac Pro 7,1 (2019) - Use x16 PCIe slot (slot 3, 4, or 5) for best performance
  • Mac Pro 5,1 - Use x16 PCIe slot (slot 2) for best performance
  • macOS 10.13.6+
  • macOS Sonoma compatible

Windows Compatibility

  • Windows computer with available full-length, full-height x16 PCIe slot (PCIe 4.0 slot preferred; PCIe bifurcation not required)
  • Windows 11 and 10
  • Windows Server 2022, 2019

Linux Compatibility

  • Linux computer with available full-length, full-height x16 PCIe slot (PCIe 4.0 slot preferred; PCIe bifurcation not required)
  • Linux Kernel 5.0+

Thunderbolt Compatibility

  • With card installed in a Thunderbolt expansion system with full-length x16 PCIe slot
  • Any Mac, Windows, or Linux computer with Thunderbolt

Power Requirements

  • When seven or eight SSDs are installed on the M.2 8x4 Silent Gen4 PCIe Card, connecting the included 6-pin PCIe auxiliary power cable between the computer’s and the card’s power connectors is  required (optional when up to six SSDs installed).

M.2 NVMe SSDs Compatibility

  • Western Digital PCIe Gen4 SSDs are NOT compatible
  • For a list of compatible M.2 NVMe SSDs, see the following PDF
M.2 NVMe SSDs Compatibility PDF Download Link


Part Number

  • FUS-SSD-8X4-E4S


  • 2-year

Form Factor

  • Full-length, full-height computer card

Internal Connectors

  • Eight M-keyed (NVMe) M.2 sockets
  • 6-pin PCIe auxiliary power connector

SSDs Supported(1)

Boot Support (From a Single SSD)

  • macOS
  • Mac Pro 5,1 or Mac Pro 7,1
  • Any Thunderbolt Mac
  • Windows, Linux
  • Computers with UEFI BIOS

RAID Support

  • macOS, Windows, Linux
  • RAID 0, 1, and 10

NVME Support

  • Yes

SSD Power/Activity Indicators

  • Yes

S.M.A.R.T. Status Data Reporting Support

  • All SSDs

RoHS Compliant

  • Yes

Package Contents

  • Sonnet M.2 8x4 Silent Gen4 PCIe Card
  • Thermal transfer pads
  • 6-pin to 6-pin auxiliary power cable for Mac Pro
  • Documentation

Support Links

Support Knowledge Base

Documentation and FAQs

Product Manual

Sonnet M.2 8x4 Silent Gent4 PCIe Card Manual PDF Download Link

Technical Notes

  • You may install fewer than eight SSDs now and add more later without needing to reformat existing ones. Only 2280 (80mm — the most common length) length M.2 SSDs are supported. M.2 SSDs longer or shorter than 80mm don’t fit.
  • Only in a 2023 Mac Pro (M2 Ultra), the initial release of macOS 14 (Sonoma) does not properly access the data in the M.2 8x4 PCIe Card. Users with macOS 13 installed should not update to macOS 14 at this time. We expect Apple to fix this anomaly in an update. (The data will not be lost, just inaccessible.) The card will continue to work fine under macOS 14 in an Intel Mac Pro, or with any Mac using a Thunderbolt expansion system.

Sonnet M.2 8x4 Silent Gen4 PCIe Card