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OWC Atlas Ultra SDXC 256GB memory card, standard SD form factor, matte black finish

OWC

OWC Atlas Ultra SDXC 256GB V90 Memory Card OWCSDV90U0256

SKU CH-8BV3-ZE1EZ MPN OWCSDV90U0256

A UHS-II SDXC card delivering 256 GB capacity with 300 MB/s read and 250 MB/s write speeds, plus V90 sustained performance

  • Card typeFull Size SD
  • TypeSDXC
  • Wireless EnabledNo
  • Capacity256GB
  • Speed Class RatingUHS-II / V90
  • Read Speed250 MB/S
  • Sustained 90 MB/s write for 6K video capture
  • Real-world 300 MB/s read and 250 MB/s write speeds
  • IP67 dust-proof and waterproof durability
  • UHS-II V90 rated for professional cameras
  • Backwards compatible with older SD devices and readers

Professional media card

The OWC Atlas Ultra SDXC 256GB is a full-size SDXC card built for photographers and videographers who need reliable high-throughput capture. Its UHS-II interface and V90 rating support sustained write performance for demanding creative workflows.

Capacity and sustained throughput

The card offers 256GB of storage and delivers a minimum sustained write speed of 90MB/s, with real-world peaks up to 250MB/s write and 300MB/s read. This headroom handles high-bitrate 4K and 6K video plus extended RAW burst sequences before the buffer fills.

V90 speed class requirement

The V90 classification guarantees 90MB/s minimum sustained write, which is the deciding factor for cameras that require this rating for their highest video modes. Cards without V90 will drop frames or stop recording in those settings. Buyers whose cameras only need U3 or V30 will not benefit from the extra guaranteed headroom.

Highlights

  • Sustained 90 MB/s write for 6K video capture
  • Real-world 300 MB/s read and 250 MB/s write speeds
  • IP67 dust-proof and waterproof durability
  • UHS-II V90 rated for professional cameras
  • Backwards compatible with older SD devices and readers

Specifications

BrandOWC
Card typeFull Size SD
SeriesAtlas Ultra SDXC
Part NumberOWCSDV90U0256
TypeSDXC
Wireless EnabledNo
Capacity256GB
Speed Class RatingUHS-II / V90
Read Speed250 MB/S
Write Speed300 MB/S
Shipping weight0.05 kg
Package size53 × 44 × 10 mm

Questions about this item

Will the 250 MB/s read and 300 MB/s write speeds work with my older UHS-I card reader?

The card is backwards compatible with previous generation SD devices and readers, but speeds will be limited to the UHS-I interface maximum.

How can I verify the card is delivering the V90 rating after setup?

A sustained write speed of at least 90 MB/s during 4K or 6K video recording confirms the V90 minimum sustained write performance.

Does the package include a card reader or just the 256GB SDXC card?

Only the memory card is supplied; a compatible UHS-II reader must be purchased separately to achieve the 250 MB/s read and 300 MB/s write speeds.

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