Lexar CFexpress 4.0 Pro Diamond R3700/W3400 128GB – PCIe 4.0 speeds up to 3700 MB/s read and 3400 MB/s write for 8K RAW

Capture cinema-quality 8K RAW and high-bit-rate video with the Lexar Professional DIAMOND CFexpress 4.0 Type B card. It uses a PCIe 4.0 interface and premium pSLC flash to deliver industry-leading transfer speeds. In addition, the card includes rugged protection features, recovery software, and a limited lifetime warranty for on-set confidence.

Speed and workflow benefits

The card delivers up to 3700 MB/s read and up to 3400 MB/s write, with a guaranteed sustained minimum of 3200 MB/s. These transfer rates support uninterrupted 8K RAW and other high-bit-rate codecs. Furthermore, when you pair this CFexpress 4.0 card with a CFexpress 4.0 reader, ingest times can drop by up to 2× versus CFexpress 2.0 media, effectively speeding post-production and accelerating your overall workflow.

Reliability and endurance

Lexar builds the DIAMOND CFexpress 4.0 on advanced pSLC flash. As a result, the card offers exceptional endurance while consuming less power. The product description references endurance figures in two ways: an endurance rating stated as up to 30 PBW, and a separate statement that pSLC architecture delivers up to 30 000 TBW of endurance. The card also carries VPG 400 certification and features on-board temperature control to help safeguard captured footage under demanding conditions.

Rugged 8-point protection

The card includes eight points of protection to withstand professional use. Specifically, the card:

Operates across a wide temperature range, from –12 °C to 72 °C.
Resists vibration and shocks encountered on set.
Is dust-proof with an IP5X rating.
Survives drops from 5 meters.
Endures 70 N compression forces.
Withstands 12,000 insertions.
Resists bends and general wear-out conditions.
Is described as seven times tougher than SD cards.

Form factor, compatibility and capacities

The compact Type B form factor fits flagship mirrorless bodies, digital cinema cameras, and high-end DSLRs. Lexar offers the DIAMOND CFexpress 4.0 in multiple capacities: 128 GB, 256 GB, 512 GB, and 1 TB, so you can choose the size that matches your capture needs.

Included software and warranty

The card comes with data recovery software to help retrieve footage if needed. In addition, Lexar provides a limited lifetime warranty with the product, giving you added assurance over the card’s useful life.

Specification	Value
Product	Lexar Professional DIAMOND CFexpress 4.0 Type B
Interface	PCIe 4.0
Read speed (max)	Up to 3700 MB/s
Write speed (max)	Up to 3400 MB/s
Sustained minimum write	Minimum sustained 3200 MB/s
Flash type	pSLC
Endurance (stated)	Noted as up to 30 PBW; pSLC architecture also referenced as delivering up to 30 000 TBW
Certification	VPG 400
Protection	8-point protection: temperature control, vibration, wear-out, dust (IP5X), drops (5 m), shocks, compression (70 N), bends, 12,000 insertions
Operating temperature	–12 °C to 72 °C
Form factor	Type B (CFexpress)
Available capacities	128 GB, 256 GB, 512 GB, 1 TB
Included	Data recovery software, limited lifetime warranty

FAQ

Question: Can this card record uninterrupted 8K RAW video?

Answer: Yes. The card delivers up to 3700 MB/s read, up to 3400 MB/s write and a sustained 3200 MB/s minimum, which supports uninterrupted 8K RAW and other high-bit-rate codecs when used in compatible cameras.

Question: How much faster will post-production be with this card?

Answer: When paired with a CFexpress 4.0 reader, ingest times can drop by up to 2× compared with CFexpress 2.0 media, which can significantly speed up your transfer and editing workflow.

Question: What protections does the card offer for on-set use?

Answer: The DIAMOND CFexpress 4.0 includes rugged 8-point protection: on-board temperature control, IP5X dust-proofing, resistance to vibration and shock, survival of 5 m drops, 70 N compression resistance, 12,000 insertions, and operation from –12 °C to 72 °C.

Question: Which cameras is this card compatible with?

Answer: The compact Type B form factor is designed to fit flagship mirrorless bodies, digital cinema cameras, and high-end DSLRs that accept CFexpress Type B media. Check your camera manufacturer’s compatibility list for CFexpress 4.0 support.

Question: Does the card include software and warranty?

Answer: Yes. The product includes data recovery software and is backed by a limited lifetime warranty as stated by Lexar.