Delkin CFexpress Type B G4 Power Card 128GB - Fast 8K Video Ready

In this review the Delkin Devices CFexpress Type B G4 Power Card 128GB is examined for professional photographers and videographers who need a compact card that will handle high-resolution, high-bitrate recording without choking. The bottom line: it is designed for users who shoot RAW or high-frame-rate 8K, 6K and 4K video and need a reliable sustained write speed to prevent dropped frames; the card's sustained performance and offload speeds are the single biggest reason to consider it.

Key Features

• Fully compatible: Works in all current CFexpress Type B hosts and modes so photographers can swap it between cameras without format worries.
• High maximum write speed: Up to 1700MB/s peak write capability supports bursty, data-heavy recording modes used in cinema workflows.
• Sustained write performance: Minimum sustained sequential write speeds of 805MB/s ensure continuous RAW or high-frame-rate 4K+ capture without buffer stalls.
• Fast offloading: Read speeds up to 1780MB/s let users transfer large projects to a workstation quickly and get back to shooting.
• 4th generation G4 technology: Engineered for modern workflows, the G4 platform balances speed and reliability for professional use.

Who It's For

The Delkin CFexpress Type B G4 Power Card 128GB is best for professional videographers and hybrid shooters who record RAW or high-bitrate 8K, 6K and 4K footage and need sustained write performance to protect continuous recording. It also suits photographers using high-speed burst modes in advanced mirrorless bodies where buffer clearing speed matters.

Casual shooters and users who rarely exceed typical SD card throughput should look elsewhere for lower-cost, lower-capacity options; likewise those who need extremely large capacities for daylong shoots may prefer higher-capacity cards or multiple cards to minimize swaps.

Pros & Cons

Pros

• Industry-grade sustained write speed reduces the risk of dropped frames during long high-bitrate recordings.
• Very fast read speed makes offloading footage to a workstation efficient for tight turnaround projects.
• Customers report consistent reliability and real-world speeds close to the rated numbers in supported cameras such as the Nikon Z6II.

Cons

• 128GB capacity may fill quickly when shooting RAW 8K or extended high-frame-rate clips, requiring more frequent card changes.

Specifications

Brand	Delkin Devices
Form Factor	CFexpress Type B
Capacity	128GB
Max Read Speed	1780MB/s
Max Write Speed	1700MB/s
Sustained Write Speed	805MB/s (minimum sequential)
Generation	G4

Our Verdict

The Delkin CFexpress Type B G4 Power Card 128GB is a strong choice for professionals who need dependable, sustained write performance and very fast offloads for high-resolution video workflows. It delivers reliable real-world speeds and compatibility with current CFexpress B hosts, offering solid value for shooters who prioritize uninterrupted recording and fast turnaround.

Frequently Asked Questions

Will this card work in my CFexpress Type B camera?
Yes; the card is fully compatible in all modes of current CFexpress Type B hosts according to Delkin's specifications.

Can it record 8K RAW without dropping frames?
Its minimum sustained write speed of 805MB/s is designed to support data-intensive modes like RAW 8K and high-frame-rate 4K recordings, though final performance depends on camera codec and settings.

How fast are transfers to a computer?
Offloading speeds can reach up to 1780MB/s, allowing rapid transfer of large files when paired with a compatible reader and host port.