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- OWC Accelsior 4M2 PCIe M.2 NVMe SSD Adapter Card OWC Accelsior 4M2 PCIe M.2 NVMe SSD Adapter Card
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The OWC Accelsior 4M2 NVMe M.2 PCIe SSD Adapter Card is a high-performance four-slot NVMe M.2 SSD to PCIe 3.0 x8 expansion card designed for Mac Pro, Windows PCs, and Thunderbolt PCIe expansion chassis. Perfect for demanding workflows like video editing, audio production, and large-scale backups, this adapter delivers blazing-fast storage expansion in a compact form factor.
Supporting up to four NVMe M.2 SSDs, the Accelsior 4M2 lets you create custom RAID arrays for maximum performance and redundancy. Whether you're building a high-capacity scratch disk or ultra-fast game library, this card delivers speeds up to 6000MB/s, making it ideal for professionals and enthusiasts alike.
Fully compatible with Mac Pro (Late 2019, 2010-2012), Windows PCs, and Thunderbolt PCIe expansion systems, the Accelsior 4M2 is the ultimate choice for anyone seeking next-gen storage flexibility and performance.
Key Features:
- Four-Slot NVMe M.2 SSD to PCIe 3.0 x8 Adapter – Supports up to four NVMe M.2 SSDs.
- Extreme Speeds – Achieve transfer rates up to 6000MB/s.
- RAID Ready – Create RAID 0, 1, 4, 5, 10 configurations for speed and redundancy.
- Wide System Compatibility – Works with Mac Pro (Late 2019, 2010-2012), Windows PCs, and Thunderbolt PCIe expansion chassis.
- Bootable Support – Mac and Windows bootable configurations.
- Compact PCIe Card Design – High-speed storage upgrade without taking up drive bays.
- Perfect for Pro Workflows – Ideal for video editing, audio production, large data processing.
Warranty:
3-Year OWC Limited Warranty – Covers defects and hardware issues.
What’s in the Box?
1 × OWC Accelsior 4M2 PCIe Adapter Card (without SSDs)
1 × User Manual
- Drive Bays: 4 bays supporting M.2 drives
- Supported SSDs: NVMe M.2 SSDs with 2280 form factor and "M Key" connector; Single- and double-sided SSDs are supported. (NVMe SSDs with a heatsink will not fit and are not supported.)
- RAID Support: Yes
- Form Factor: M.2 - 2280 "M Key"
- Drive Interface: PCIe 3.0 x8, NVMe 1.3
- RAID Capable: Yes
- RAID Features: Software RAID capable (OWC SoftRaid Software as an option)
- Internal Connectivity: (4) NVMe M.2 Slots (PCIe 3.0 x4)
- 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)
- PCIe Bandwidth Allocation: Advanced switch providing total eight lanes of bandwidth, with any single drive using up to four lanes max.
- Chipset / Controller: ASMedia ASM2824
- Power/Activity LED: Yes
- 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)
- Certifications: CE, FCC, RoHS Compliant
- 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
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Notes:
- NVMe SSDs with a heatsink are not supported.
- Backward compatible with PCIe 2.0 slots (reduced speeds).
- Performance limited to 2800MB/s in Thunderbolt 3 PCIe expansion chassis.
- Bootable using a single M.2 startup disk; other slots can be used for independent volumes or software RAID.
- Requires macOS 10.14.6 for Mac Pro (2010-2012), macOS 10.15.1+ for Mac Pro (2019).
- Some SSDs (Hynix Gold P31, Samsung PM981a) are Windows 10 only.
- LED function disabled when used with OWC Aura Ultra IV 8TB NVMe SSD (OWCP4U8T1PT08).
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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
macOS 14.x Sonoma
macOS 15.x Sequoia -
PC OS Compatibility:
Windows 10 64-bit Edition
Windows 11
Windows Server 2016
Windows Server 2022 -
Other OS Compatibility:
Linux kernel versions 5.4 or later
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Mac Pro (Late 2019) (December 2019):
Model ID: MacPro7,1 | 2.5GHz 28-Core
Model ID: MacPro7,1 | 2.7GHz 24-Core
Model ID: MacPro7,1 | 3.2GHz 16-Core
Model ID: MacPro7,1 | 3.3GHz 12-Core
Model ID: MacPro7,1 | 3.5GHz 8-Core
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Mac Pro (Mid 2010 - Mid 2012):
4-Core (Mid 2010) Model ID: MacPro5,1 | 2.8GHz, 3.2GHz
6-Core (Mid 2010) Model ID: MacPro5,1 | 3.33GHz
8-Core (Mid 2010) Model ID: MacPro5,1 | 2.4GHz
12-Core (Mid 2010) Model ID: MacPro5,1 | 2.66GHz, 2.93GHz
4-Core (Mid 2012) Model ID: MacPro5,1 | 3.2GHz
6-Core (Mid 2012) Model ID: MacPro5,1 | 3.33GHz
12-Core (Mid 2012) Model ID: MacPro5,1 | 2.4GHz, 2.66GHz, 3.06GHz
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Mac Pro Rack (Early 2020) (January 2020):
Model ID: MacPro7,1 | 2.5GHz 28-Core
Model ID: MacPro7,1 | 2.7GHz 24-Core
Model ID: MacPro7,1 | 3.2GHz 16-Core
Model ID: MacPro7,1 | 3.3GHz 12-Core
Model ID: MacPro7,1 | 3.5GHz 8-Core