OWC Accelsior 4M2

OWC Accelsior 4M2 OWC Accelsior 4M2 Front OWC Accelsior 4M2 Back OWC Accelsior 4M2 Hero OWC Accelsior 4M2 SSD

OWC Accelsior 4M2

Over 6000MB/s

Blistering fast speeds

Up to 32TB

Room for large format files

Quick Specs:

  • Includes SoftRAID
  • Plug and play
  • PCIe 3.0 x8
  • (4) M.2 NVMe SSDs
  • Mac & PC

High-Performance PCIe M.2 NVMe SSD Solution

  • Work Faster: over 6,000MB/s real world speed in RAID 01
  • Supercharges Mac and PC: ideal for Mac Pro 2019, Mac Pro 2012 or 2010, and PC towers
  • Highly Versatile: installs into a full-height, half-length x8 or x16 PCIe 3.0 or 2.0 slot2
  • Slot-Powered: no extra power cables needed
  • Includes SoftRAID: robust software for creating, monitoring, and managing advanced RAID sets

  • Performance & reliability at an exceptional value

  • Easy DIY install videos. Learn more »

  • Have questions? We have answers. Get help »

  • 30-day 100% Money-Back Guarantee. Learn more »

OWC Accelsior 4M2

Work Faster Than Ever

Accelsior 4M2 NVMe SSD is one of OWC’s fastest SSDs, with over 6,000MB/s speed for large format video editing, VR/AR/MR environments, extreme gaming, and other high bandwidth needs. Available in capacities up to 32TB, Accelsior 4M2 raises the performance bar for Mac Pro 2019, Mac Pro 2012 and 2010, and PC towers.

It offers silent cooling via a finned heat sink cover and installation versatility with a half-length x8/x16 design. If a Mac/PC doesn’t have an open or compatible PCIe slot but is Thunderbolt 3-equipped, Accelsior 4M2 can be used externally in the OWC Mercury Helios 3S.3

OWC Accelsior 4M2

over 6,000MB/s real world speed in RAID 01

ideal for Mac Pro 2019, Mac Pro 2012 or 2010, and PC towers

installs into a full-height, half-length x8 or x16 PCIe 3.0 or 2.0 slot2

no extra power cables needed

finned heat sink cover for fanless operation

pre-configured solutions undergo performance verification

start working in seconds4

up to 5 Year OWC Limited Warranty5

The Performance Advantage of NVMe

Non-Volatile Memory Express (NVMe) is a communication standard specifically built to optimize the performance of modern flash technology. It enables significantly faster SSD performance vs an SSD using the SATA interface, a communication protocol that was originally designed for hard disk drives. With NVMe SSDs powering its heartbeat, Accelsior 4M2 delivers extreme data rates that will change the way you work or play.

Inside the OWC Accelsior 4M2

More Lanes = Faster Throughput

Accelsior 4M2 was designed with a PCIe switch to let your computer address each of the M.2 NVMe drives at full x4 PCIe speeds instead of hard-limiting each drive to x2 PCIe speeds. When running in JBOD, where all four drives are typically not accessed at the same time, each drive has the unlocked capability to run at full speed.

OWC Accelsior 4M2 Throughput

2 to the Second Power

When over 6,000MB/s real world speed and 32TB of capacity isn’t enough to satisfy your needs, you can RAID two Accelsior 4M2 cards together to experience out-of-this-world performance.

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Easy and Complete Drive Management with SoftRAID XT

SoftRAID XT is the most powerful, intuitive RAID management software on the market for macOS and Windows. SoftRAID’s RAID creation and management technology has been finely tuned to perfection with over 20 years of development to provide rock solid protection of your data and optimize drive performance. It is packed with features like multiple RAID options, validation and verification of drives, and predictive disk failure with SoftRAID Monitor. SoftRAID provides a level of performance that you simply can’t get with hardware RAID.

Multiple RAID Levels

Create advanced RAID 0/1/4/5/1+0 (10)1 volumes for higher performance and/or redundancy.2

Disk Health

More accurate than SMART, SoftRAID protects your data by alerting you to issues before anything happens, providing peace of mind and giving you more time to address issues. Solutions that rely exclusively on SMART data can be seeing performance loss or corruption before flagging an issue.


Built-in MacDrive technology lets you read/write SoftRAID HFS+ RAID 0/1/5 arrays and use them interchangeably between Windows and macOS.

Flexible, Upgradeable

With SoftRAID you’re not locked to expensive hardware. SoftRAID is upgradable and portable.

Easy License Management

New license management enables quick activation or deactivation so your license can move between computers.


Works with macOS 10.12 or later and Windows 10 and later.3

SoftRAID is ideal for anyone who needs to safely store and backup massive amounts of data, including video editors, audio producers, photographers and graphic designers.

  1. RAID 4/1+0 (10) is available for Mac only at this time.
  2. Improved data protection/redundancy requires RAID 1/4/5/1+0.
  3. SoftRAID serial numbers work on both Mac and Windows. SoftRAID is licensed per computer. In order to use SoftRAID on multiple computers, you will need a unique, valid license per computer. Additional licenses can be purchased anytime.

Your Digital Life...
Protected for Free

Your data is irreplaceable, and we take protecting it seriously. That's why this OWC Solution includes Acronis Cyber Protect Home Office – the world's only combination backup and antimalware solution that keeps your data protected from accidents, failures, and malware/ransomware attacks.

  • Complete Backup And Fast Recovery - Quickly restore your files or entire system at any time.
  • Easy Disk Cloning and Full Image Backup - Just two clicks to start a full disk image backup.
  • Cloud, Local or Hybrid Cloud Backup - Back up locally, to the cloud, or both. With 250GB of cloud storage, it’s your choice.
  • Integrated Protection from Malware - Behavioral heuristics stop ransomware and cryptojacking.

Learn more about Acronis Cyber Protect Home Office »

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OWC Aura P12 Pro NVMe M.2 SSD

OWC Aura P12 Pro

The perfect match for Accelsior 4M2.

Combine Accelsior 4M2 with its perfect performance match – fast OWC Aura P12 Pro NVMe M.2 SSDs. Build your own ultra-fast RAID ready PCIe internal storage solution, and enjoy incredible transfer speeds, capacity, and OWC reliability!

Shop Aura P12 Pro NVMe M.2 SSDs »

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This ultra high-performance 8-drive PCIe NVMe M.2 SSD solution provides mind-blowing performance – up to 12,000MB/s in Mac Pro and PCIe Gen 3 PCs, and over 26,000MB/s with PCIe Gen 4-capable computers!

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OWC Accelsior 1M2

OWC Accelsior 1M2

High-Performance PCIe NVMe SSD Solution

The speed boosting, capacity expanding M.2 SSD to PCIe adapter card for performance upgraders, system builders, and server admins.

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OWC Accelsior 1A

OWC Accelsior 1A

PCIe Adapter Card for Apple and OWC Aura SSDs

Repurposes an Apple factory flash drive from most 2013 to 2019 Mac models into a high-performance PCIe SSD.

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OWC, Trusted by Pros & Enthusiasts the World Over

OWC, Trusted by Pros & Enthusiasts the World Over

We build our hardware to the highest standards of reliability and performance. Because 100% reliability is always the goal, we rigorously quality test and back our hardware with a 5 Year OWC Limited Warranty and award-winning customer support.

Learn More
  1. Data transfer rates will vary based on SSDs used, CPU speed, RAID setting, and PCIe version.
  2. Backward compatible with PCIe 2.0 slots at reduced speeds.
  3. Performance in a Thunderbolt 3 PCIe expansion chassis limited by maximum Thunderbolt 3 PCIe bandwidth of 2,800MB/s.
  4. Bootable using a single, independent M.2 startup disk, with the other three M.2 SSDs configured as independent volumes or as a software RAID (SoftRAID or Apple RAID). macOS 10.14.6 required on Mac Pro (2010-2012). macOS 10.15.1 or later required on Mac Pro (2019).
  5. 5 Year OWC Limited Warranty for 1.0TB and higher capacity PCIe SSD solutions. 3 Year OWC Limited Warranty for PCIe Expansion Card only.