The Lexar CFexpress 4.0 Type B Pro Diamond 256GB (R3700/W3400) memory card is a very fast memory card that is suitable for even the most demanding use thanks to its incredible 3700Mb/s read speed and 3400MB/s write speed.

The Lexar CFexpress 4.0 Type B Pro Diamond 256GB (R3700/W3400) memory card is a very fast PCIe 4.0 capable memory card, which is suitable for even the most demanding use thanks to its incredible 3700Mb/s read speed and 3400MB/s write speed.
These cards are fast enough to shoot 4K, 6K and even 8K Raw video, as well as fast-paced burst shooting situations. Your workflow is also faster. Pair this card with a CFexpress 4.0 reader for fast viewing and editing.
Lexar's Diamond series cards are more durable than usual. The cards are designed to operate in temperatures ranging from -10 to 70 degrees Celsius, but customers say that even colder weather has not been a problem. The card has the VGP-400 standard, which means that its write speed is at least 400 MB/s in all conditions.
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