8.0TB OWC Accelsior 4M2
Four-Drive NVMe M.2 PCIe 3.0 SSD Storage Solution with SoftRAID for Mac Pro (2010 - 2012) & PC Towers
Mfr P/N: SSDACC4M208T OWC SKU: OWCSSDACC4M208T
High-Performance PCIe M.2 NVMe SSD Solution
- Supercharges Mac and PC: designed for Mac Pro (2010 - 2012) and PC towers
- Work faster: over 6,000MB/s real-world speed in RAID 0
- Store more: add capacity for critical footage, images, files, and games
- Includes SoftRAID: robust software for creating, monitoring, and managing advanced RAID sets
- Silent cooling: finned heat sink cover for fanless operation
- Highly versatile: installs into a full-height, half-length x8 or x16 PCIe 3.0 or 2.0 slot
- Plug and play: no drivers needed
- 5 Year OWC Limited Warranty
Meet the Fastest OWC SSD Ever Built
When OWC launched its first Solid State Drive in 2010, it was engineered to deliver the same attribute formula that Mac and PC users expected from OWC external storage solutions:
High performance + high reliability + affordable price = The OWC Difference
Nearly a decade later, our commitment to that winning formula remains steadfast as we push the boundaries of leading-edge SSD development with the Accelsior 4M2. It’s ideal for uncompromised, data intensive, high bandwidth needs like large format video editing, VR/AR/MR environments, high transactional and complex calculation applications, and extreme gaming.
Accelsior 4M2 houses up to four Aura Ultra III M.2 NVMe SSDs under a finned heat sink cover that provides silent, throttle-free cooling. These “blade” style SSDs utilize Triple-Level Cell (TLC) 3D NAND with SLC caching and a Phison E12 controller with 7% over-provisioning.
All those “ingredients” combine to deliver over 6,000MB/s real-world speed with the highest reliability possible to satisfy the biggest storage performance appetite.
Highly Versatile with Mobile Possibilities
Whether you have a Mac Pro 2012 or 2010, or PC tower, Accelsior 4M2 can go to work for you. As a half-length x8/x16 compatible card, this game-changer offers the versatility you need, so you’re not tied to one slot size or limited by a space-confined computer case.
You can also enjoy the performance boosting benefits of Accelsior 4M2 with your Thunderbolt 3-equipped notebook computer, iMac workstation, or slot filled gaming rig. It’s plug-and-play easy with a PCIe expansion chassis like the OWC Mercury Helios 3S (sold separately and coming soon).
Change Your Reality
Accelsior 4M2 offers performance gains in so many diverse ways that it will change your storage reality:
- Stream and edit high-res video and graphics files without a glitch.
- Experience faster previews, renders, and processing in VFX programs.
- Keep page scenery and textures looking sharp and flowing uninterrupted in virtual reality environments.
- Enhance the realism of augmented reality visualizations.
- Change levels seamlessly and play simulation and MMO games with continuously changing scenery or heavy mods without micro-stuttering.
- Give your computer a significant speed boost with improved system “snappiness”, a fast OS boot drive, or a bottleneck-free scratch drive.
Includes SoftRAID: Easy and Complete Drive Management
Accelsior 4M2 includes SoftRAID software to help you manage your data like a pro. You can maximize drive space, get the fastest access speeds, and protect against drive failure with plug-and-play simplicity. SoftRAID’s easy setup makes it a breeze to create RAID volumes by helping you through the entire process. Just decide what you’re using your RAID volume for and how much space to allocate to it. It's that simple to create your preference of speed and/or redundancy attributes of your data volume. Learn more about SoftRAID.
Professional Grade = Ready to Work
We understand having confidence in gear reliability is paramount to creative professionals. That’s why every Accelsior 4M2 pre-configured solution undergoes a multi-step performance certification prior to shipping. This ensures your Accelsior 4M2 arrives operating properly and immediately ready for demanding use.
Includes
- (1) OWC Accelsior 4M2 Storage Solution
- (1) Quick Start Guide for OWC Accelsior 4M2
- (1) Assembly Manual & User Guide for OWC Accelsior 4M2
- (1) 3 Years of SoftRAID Premium Access (License located on device)
- (1) Quick Start Guide for OWC SoftRAID (Digital)
- 5 Year OWC Limited Warranty
Specs
Drive Bays
- 4 bays supporting: M.2 drives
- Supports NVMe M.2 SSDs with 2280 form factor and "M Key" connector type. Single- and double-sided SSDs are supported.
Total Capacity
- 8.0TB
Formatted Capacity
- 7451GiB
Drive Mechanism
- (4) 2.0TB OWC Aura Ultra III PCIe 3.0 NVMe M.2 2280 Solid-State Drive
- *OWC reserves the right to replace or upgrade to equivalent or better components.
Controller
- Phison E12
NAND Flash Components
- Toshiba Synchronous Triple-Level Cell (TLC) 3D NAND Flash
S.M.A.R.T. Attributes
- Standard attributes supported
Native Command Queuing (NCQ)
- Up to 32 simultaneous commands
RAID Support
- Yes
Form Factor
- M.2 -
Drive Interface
- PCIe 3.0 x4, NVMe 1.3
RAID Capable
- Yes
RAID Features
- Software RAID
RAID Management
- Includes OWC SoftRAID RAID Management Software
Sequential Read (Max)
- Up to 6318 MB/s
Sequential Write (Max)
- Up to 6775 MB/s
Sequential Read (Average)
- 6280 MB/s
Sequential Write (Average)
- 6356 MB/s
Card Interface
- PCIe
PCIe Bus Interface
- PCI Express 3.0 x8
PCIe Form Factor
- PCIe x8 full height, half length
- Compatible with PCIe x8 slots or larger
Chipset / Controller
- ASMedia ASM2824
Nonrecoverable Read Errors
- 1 per 1016 bits read
TRIM Support
- OS Dependent
Error Correction
- Built-in ECC
Endurance
- 3115TB total bytes written (TBW), equal to 1220 GB per day for 7 years
Mac OS Compatibility
- macOS 10.13 High Sierra
- macOS 10.14 Mojave
- macOS 10.15 Catalina
- macOS 11.x Big Sur
- macOS 12.x Monterey
- macOS 13.x Ventura
PC OS Compatibility
- Windows 10 32-bit Edition
- Windows 10 64-bit Edition
- Windows Server 2019
- Windows Server 2016
- Windows Server 2022
- Windows 11
Other Requirements
- Requires macOS 10.13.6 or later.
Dimensions
- Height: 12.6 cm (5.0 in)
- Length: 18.1 cm (7.1 in)
- Width: 2.2 cm (0.9 in)
Weight
- 381.0 g (0.84 lbs)
Activity LED
- Yes
Certifications
- CE
- FCC
RoHS Compliant
- Yes
Ambient Temperature
- Operating: 41°F to 95°F (5°C to 35°C)
- Non-Operating: -4°F to 140°F (-20°C to 60°C)
Altitude
- Operating: -304.8 m to 3,048.0 m (-1,000 ft to 10,000 ft)
- Non-Operating: -304.8 m to 12,192.0 m (-1,000 ft to 40,000 ft)
Humidity
- Operating: 8% to 90% non-condensing
- Non-Operating: 5% to 95% non-condensing
Idle (Typical)
- 0.0 bels
Seek (Typical)
- 0.0 bels
- Before installing this product in a host device, write down the SoftRAID serial number that is listed on the back of the PCIe card. It is needed to setup the SoftRAID application.
- Data transfer rates will vary based on SSDs used, CPU speed, RAID setting, and PCIe version.
- Backward compatible with PCIe 2.0 slots with reduced speeds.
- Performance in a Thunderbolt 3 PCIe expansion chassis limited by maximum Thunderbolt 3 PCIe bandwidth of 2800MB/s.
- 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). Mac Pro (2010-2012) requires macOS 10.14.6. Mac Pro (2019) requires macOS 10.15.1 or later.
- When installed, the following SSDs will only be compatible with Windows 10 systems: Hynix Gold P31, Samsung PM981a.
- The LED function of this product will be disabled and not function if used with an 8TB OWC Aura Ultra IV MVMe M.2 SSD (OWCP4U8T1PT08).
Compatibility & Installation Videos
Note: macOS requires 10.13.6 or later
Mac Pro

Mac Pro (Mid 2012)
Mid 2012
Model ID: MacPro5,1
3.2GHz 4-Core Xeon & 3.33GHz 6-Core Xeon & 2.4GHz & 2.66GHz & 3.06GHz 12-Core Xeon

Mac Pro (Mid 2010)
Mid 2010
Model ID: MacPro5,1
2.8GHz & 3.2GHz 4-Core Xeon & 2.66GHz & 2.93GHz & 3.33GHz & 3.46GHz 6-Core Xeon & 2.4GHz 8-Core Xeon & 2.66GHz & 2.93GHz & 3.06GHz & 3.33GHz & 3.46GHz 12-Core Xeon