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Red SanDisk Extreme Pro SDXC card, 256GB, UHS-II, 300MB/s read, 260MB/s write

SanDisk

SanDisk Extreme Pro SDXC UHS-II 256GB 300MB/s memory card

SKU CH-MQTM-WY4GK

A 256 GB SDXC card rated UHS-II with 300 MB/s read and 260 MB/s write speeds, supporting V90 and U3 for 8K video

  • Card typeFull Size SD
  • TypeSecure Digital Extended Capacity (SDXC)
  • Capacity256GB
  • Speed Class Ratingclass_10
  • Read Speed300 megabytes_per_second
  • Write Speed260 MB/s
  • Up to 300 MB/s read speed accelerates post-production transfers
  • Up to 260 MB/s write speed clears buffers for continuous burst shooting
  • V90 and U3 ratings sustain cinema-quality 8K and 4K video
  • 256 GB capacity stores large volumes of high-resolution files
  • Shockproof, temperature-proof, waterproof and X-ray-proof build protects data in harsh conditions

Pro Performance for Advanced Capture

The SanDisk Extreme Pro SDXC card delivers 256GB of storage built for professional and advanced photographers and videographers. It supports cinema-quality 8K, 4K and Full HD recording with sustained V90 video speeds and UHS Speed Class 3 (U3) ratings. Super-fast write speeds up to 260MB/s help rapidly clear buffer time for continuous burst mode shooting. Extreme transfer speeds up to 300MB/s accelerate post-production workflow efficiency when paired with a compatible reader.

Simple Insertion with UHS-II Requirements

Installation is straightforward: insert the full-size SD card into a compatible camera, recorder or card reader slot. The card uses a UHS-II interface, so maximum read and write performance requires a device and reader that support the UHS-II standard. Using older UHS-I slots will limit speeds to the lower standard. No drivers or software setup are needed, but verifying host compatibility beforehand prevents unexpected bottlenecks.

UHS-II Interface Limits and Durability

Practical throughput is capped by the UHS-II bus and the host device capabilities; the card alone cannot exceed the slot's maximum bandwidth. Sustained V90 performance demands a host that can maintain the required write rate throughout recording. The card is designed to be shockproof, temperature-proof, waterproof and X-ray-proof for travel resilience, though physical damage to contacts or extreme conditions beyond specifications can still cause failure.

Highlights

  • Up to 300 MB/s read speed accelerates post-production transfers
  • Up to 260 MB/s write speed clears buffers for continuous burst shooting
  • V90 and U3 ratings sustain cinema-quality 8K and 4K video
  • 256 GB capacity stores large volumes of high-resolution files
  • Shockproof, temperature-proof, waterproof and X-ray-proof build protects data in harsh conditions

Specifications

BrandSanDisk
Card typeFull Size SD
SeriesCard Only
ModelSDSDXDK-256G-GN4IN
Part NumberSDSDXDK-256G-GN4IN
TypeSecure Digital Extended Capacity (SDXC)
Capacity256GB
Speed Class Ratingclass_10
Read Speed300 megabytes_per_second
Write Speed260 MB/s
Option256GB

Questions about this item

How can I verify the card is delivering its 300MB/s read and 260MB/s write speeds after setup?

Use a UHS-II card reader and benchmark software to measure sequential read and write speeds; the card is rated for 300MB/s read and 260MB/s write on compatible devices.

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

The package contains the 256GB SDXC card only; a UHS-II reader such as the SanDisk Extreme PRO SD UHS-II USB-C Reader is sold separately.

Which capacity should I choose for sustained V90 8K video recording?

The 256GB version provides the stated V90 sustained write speed for cinema-quality 8K, 4K and Full HD recording.

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