OWC Express 4M2 Ultra

Four-Slot Thunderbolt 5 (80Gb/s) NVMe M.2 RAID Enclosure — The Fastest Compact DIY NVMe RAID. Period.

Up To6622MB/sreal-world Thunderbolt 5 performance¹

Thunderbolt 580Gb/sTB5/4, USB4 & TB3 Macs & PCs

ExpandableUp to 128TB4 NVMe slots · daisy-chain

DIY Enclosure

Add your own NVMe M.2 SSDs$—

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With SoftRAID

Includes SoftRAID software$—

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Your Drives. Your RAID. Powered by Thunderbolt 5.

You asked for it. We delivered. Express 4M2 Ultra combines everything creative professionals like you dreamed about: the freedom to choose any NVMe M.2 drive, the flexibility to configure your storage exactly how you need it, and the dramatically improved efficiency of your workflow with Thunderbolt 5 bandwidth. Now you can build a desktop powerhouse RAID with your choice of drives and experience up to 6622MB/s performance that turns massive 12K RAW video files, 8K multi-cam sequences, and monster photo libraries into effortless workflows. From backing up media cards on set to working through intense VFX compositing in post, Express 4M2 Ultra delivers the customization and speed you need to stay ahead of deadlines.

OWC Express 4M2 Ultra cutaway showing four NVMe M.2 slots

Key Features

Maximum PerformanceUp to 6622MB/s¹ real-world speed for 12K RAW video, 8K multi-cam sequences, batch processing of high-res images, and large data sets.

Your Drives, Your RAIDDIY-easy install of four NVMe M.2 2280 or 2242 single or double-sided PCIe 3.0/4.0/5.0 SSDs. RAID 0/1/4/5/10/JBOD via SoftRAID or another RAID utility — you decide the RAID level.

Time is Money. Save Big on BothThe DIY design lets you swap in faster, larger drives as they become available without buying a new enclosure, while Thunderbolt 5 speed cuts your ingestion times in half.

Scale As You GrowStart with up to 32TB today in a single enclosure and expand up to 128TB as one volume by daisy-chaining additional Express 4M2 Ultras.

Connect All Your DevicesDaisy-chain up to five additional Thunderbolt devices plus one USB peripheral via the second Thunderbolt 5 port.

Highly CompatibleUse with Thunderbolt 5, 4, and USB4 Macs and PCs, as well as Thunderbolt 3 Macs.

Unleash Maximum Speed with Thunderbolt 5

Express 4M2 Ultra is the fastest DIY multiple NVMe SSD enclosure we offer and was purposefully built to harness Thunderbolt 5’s incredible 80Gb/s bandwidth. Experience up to 6622MB/s performance with your Mac or PC. Connect to Thunderbolt 4 or USB4 systems and still get speeds up to 3200MB/s. Even Thunderbolt 3 Macs tap into blazing performance. You’re never locked out, and you’re always ready for your next system upgrade.

Over 2x Faster Multi-Camera Ingest

In the fast-paced, tight-budget world of filmmaking where time is money, every minute saved is critical. When you’re juggling multiple cameras or offloading a variety of media cards simultaneously, you’ll keep your production running ahead of schedule by ingesting over twice as fast with Express 4M2 Ultra vs 40Gb/s storage.

Full Speed with Full Focus

High-performance NVMe drives in RAID configurations generate serious heat. Whether you’re rendering 8K footage, ingesting multiple media cards, or running intensive database operations, you get maximum performance without the noise that breaks creative focus or the thermal throttling that kills productivity. Express 4M2 Ultra’s solid aircraft-grade aluminium body provides passive cooling and rugged protection, while a smart adaptive fan quietly activates only during sustained workloads.

Build Your Perfect Storage Solution

Engineered to support any NVMe M.2 2280 or 2242 SSD, this compact powerhouse gives you total freedom to choose your preferred brand, capacity and performance level — whether it’s bleeding-edge PCIe 5.0/4.0 drives or mid-level PCIe 3.0 drives you may already own.¹ Add up to a massive 8.0TB per drive for 32TB total. When tomorrow’s 16TB drives hit the market, you can easily boost your Express 4M2 Ultra’s capacity without buying a new enclosure. Your storage. Your choice. Your future.

Expands With Your Growing Needs

Start with up to 32TB in a single compact enclosure. When you need more capacity, daisy-chain additional Express 4M2 Ultra units through the second Thunderbolt 5 port to create one huge, unified volume instead of juggling multiple drive letters or splitting projects across locations. Four enclosures give you 128TB and beyond. The second Thunderbolt 5 port also lets you connect up to five additional Thunderbolt devices plus one USB peripheral. Your workspace grows exactly how you need it.

More Powerful with SoftRAID

Need more power and protection? Choose a solution that includes OWC’s powerful SoftRAID RAID software. SoftRAID is the most powerful, intuitive software RAID utility on the market. Multiple RAID levels let you select the level that fits you or your project’s needs best — maximum volume capacity, optimum drive performance, data protection, or a combination.

Packed with features like drive validation, verification and failure prediction, SoftRAID includes capabilities you simply don’t get with hardware RAID. It’s like having a datacenter on your desktop — from home users protecting photos and documents to professionals protecting and quickly accessing projects.

Express 4M2 Ultra is Ideal For

DITs and Filmmakers building the fastest compact NVMe SSD RAID with expandable capacity, daisy-chaining additional enclosures into a massive single volume, and maximum offload speeds with thermal stability when backing up media cards from multiple cameras on set.
Professional video editors, VFX artists, colourists, and high-volume photographers seeking the fastest NVMe SSD RAID for demanding post-production — 12K RAW video, VFX compositing, 8K RAW or ProRes multicam sequences, and batch editing ultra-high-resolution images.
Performance-driven professionals, power users, and technical teams who require full control over capacity, speed, and scalability — the ultimate DIY Thunderbolt 5 NVMe RAID platform for pushing demanding, data-intensive workflows beyond conventional limits.