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 6,000MB/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 - Current), Mac Pro (2010 - 2012), 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 - Current), Mac Pro (2010 - 2012), 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 - Current), Mac Pro (2010 - 2012), 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.

The Most Powerful RAID Tool on the Planet.

SoftRAID is the world’s fastest and most flexible application to configure, maintain, and protect your RAID volumes on Mac and PC. OWC enclosures include 3 Years of SoftRAID Premium.

  • High-Performance RAID 0/1/4/5/1+0 (10) volumes
  • Predictive Health Monitoring proactively notifies of Volume and Disk issues well before failure — provided on your computer and remotely
  • 35+ Years of Experience of Pro Support to provide peace-of-mind with setup help, ongoing questions, or urgent disk issues
  • And many more unique features.
  • Learn more about SoftRAID

M1 Macs require macOS 11.3 or later. SoftRAID is licensed per computer. RAID 1+0 (10) coming soon to Windows.

iMac Pro with SoftRAID
OWC Aura Ultra III NVMe M.2 SSD

OWC Aura Ultra III

The perfect match for Accelsior 4M2.

Combine Accelsior 4M2 with its perfect performance match – fast OWC Aura Ultra III 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 Ultra III NVMe M.2 SSDs »

More PCIe Storage Solutions from OWC

OWC Accelsior 8M2

OWC Accelsior 8M2

OWC Beyond Fast™ – The fastest, highest capacity PCIe SSD in the galaxy.

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!

Shop Now »

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.

Shop Now »

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.

Shop Now »

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 - Current).
  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.