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Rectangular silver memory card with black label text

Lexar

Lexar Diamond Series 256GB CFexpress 4.0 Type-B Memory Card

SKU CH-4M19-EEXM8

A CFexpress 4.0 Type-B card with 256GB capacity, up to 3700MB/s read, 3400MB/s write, 3200MB/s sustained write, IP5X dust-proof, 5-meter drop-proof, 70N compression resistance.

  • Read speeds up to 3700MB/s accelerate post-production workflows
  • Write speeds up to 3400MB/s with 3200MB/s sustained capture 8K RAW video
  • 256GB capacity stores extensive high-resolution photo and video libraries
  • IP5X dust-proof, 5-meter drop-proof and 70N compression resistance protect data
  • Operating range -12°C to 72°C and storage range -25°C to 85°C ensure reliability

Professional CFexpress 4.0 Card

The Lexar Diamond Series 256GB CFexpress 4.0 Type-B card targets professional photographers and cinematographers who require sustained high throughput for 8K RAW video and high-resolution burst shooting. Its PCIe Gen 4 interface delivers maximum read speeds of 3700MB/s and write speeds of 3400MB/s with a 3200MB/s minimum sustained write rate. The VPG400 rating guarantees consistent performance for cinema-quality capture.

Thermal Range and Power Efficiency

The card operates reliably from -12°C to 72°C and withstands storage temperatures from -25°C to 85°C, covering demanding outdoor and studio environments. IP5X dust protection and resistance to 70N compression, 5-meter drops, vibration, shock and bending protect data integrity under physical stress. Leveraging pSLC technology, the design achieves lower power consumption and a longer lifespan rated up to 30000TBW.

Workflow Integration and Compatibility

The Type-B form factor fits cameras and recorders supporting the CFexpress 4.0 standard, freeing users from slower media bottlenecks during high-bitrate recording. Pairing with a CFexpress 4.0 Type-B reader such as the Lexar Professional Workflow model accelerates offload to twice the speed of CFexpress 2.0. Bundled data recovery software adds a safety net for accidental deletion or corruption. Buyers needing larger capacities or alternative form factors must look elsewhere.

How it compares

Measured against everything we stock in SD & MicroSD Memory Cards, at today’s prices. Recalculated every night.

Price $247.99
Pricier than about 90% of the 1,947 comparable items (median $46.99).

Specifications

No published specifications for this item yet.

Questions about this item

How do I install the Lexar Diamond Series CFexpress 4.0 Type-B card, and what is the common mistake?

Insert the card into a CFexpress Type-B slot with the label facing up until it clicks; the step often missed is confirming the host device supports PCIe 4.0 and VPG400 so the 3200MB/s minimum sustained write speed is actually available.

What maintenance or replacement will this 256GB card need later?

The pSLC design is rated for up to 30000TBW; no routine maintenance is required, but the card should be replaced once the wear indicator in your camera or reader approaches that limit.

What limit appears first during sustained 8K RAW recording?

The 3200MB/s minimum sustained write speed is the first bottleneck; if the camera demands more than that continuously, frames will drop before thermal throttling from the 72°C operating ceiling becomes a factor.

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