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Silver aluminum four-bay NVMe M.2 enclosure with USB4 40Gbps

OWC

OWC Express 4M2 OWCUS4EXP4M2S 4-Bay NVMe M.2 2230/2242/2280 USB4 40Gb/s Drive Enclosure

SKU CH-XMET-T0P9Q MPN OWCUS4EXP4M2S

Four-bay NVMe M.2 enclosure delivers up to 3200MB/s over USB4 40Gb/s with smart adaptive fans for near-silent operation

  • SizeM.2
  • Drive interfaceM.2 NVME M-Key
  • External connectionUSB 4.0 (40 Gbit/s) (USB-C)
  • Supported drives4 SSD
  • Bay count4
  • Product colorSilver
  • Up to 3200MB/s real-world speed with USB4 40Gbps
  • Works with USB4, Thunderbolt and USB-C Macs and PCs
  • Aircraft-grade aluminum chassis dissipates heat for consistent performance
  • Smart adaptive fans run only when needed for near-silent operation
  • Accepts NVMe M.2 2230, 2242 or 2280 SSDs for DIY RAID builds

Four-Bay NVMe RAID Enclosure

The OWC Express 4M2 is a four-bay NVMe M.2 SSD enclosure with a USB 4.0 40Gbps external interface. It accepts 2230, 2242 and 2280 form factors and ships with SoftRAID Premium software. Aircraft-grade aluminum construction provides heat dissipation for sustained performance up to 3200MB/s real-world speed.

Creative Professionals and DIY Builders

This enclosure suits users building a high-performance desktop RAID array with their own choice of NVMe SSDs. Smart adaptive fans stay off until thermal load requires them, enabling near-silent operation for audio or video work. It is not suited for buyers needing 2.5-inch or 3.5-inch drive support, or those requiring more than four M.2 slots.

USB 4.0 40Gbps Host Connection

The single specification that determines compatibility is the USB 4.0 40Gbps (USB-C) host interface. Your computer must provide a USB4, Thunderbolt or USB-C port capable of this bandwidth to reach the advertised 3200MB/s throughput. Older USB 3.x ports will limit performance proportionally.

How it compares

Measured against everything we stock in External Drive Enclosures, at today’s prices. Recalculated every night.

Price $234.99
Pricier than about 90% of the 821 comparable items (median $30.99).

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Specifications

Product
Brand nameOWC
Product lineExpress 4M2
Model nameM.2 SSD Enclosure
Product colorSilver
Product typeEnclosure
Storage
Drive interfaceM.2 NVME M-Key
Supported drives4 SSD
Bay count4
Ports & slots
External connectionUSB 4.0 (40 Gbit/s) (USB-C)
Power
Power adapterYes
Size & build
SizeM.2
Main materialAluminum
Shipping weight2.27 kg
Package size269 × 213 × 89 mm

Questions about this item

What comes in the box and do I need to buy SSDs separately?

The enclosure ships with a USB4 cable and an AC adapter. You must supply up to four NVMe M.2 2230, 2242 or 2280 SSDs yourself.

Which M.2 lengths does the enclosure accept?

Each of the four bays supports NVMe M.2 2230, 2242 and 2280 drives, so you can mix capacities and form factors as you wish.

What does the 3200MB/s figure mean in daily use?

That is the real-world throughput ceiling over the USB4 40Gbps link when the installed SSDs are configured in a RAID set.

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