Quick answer

The Delkin CFexpress POWER 128GB is a solid choice if your camera takes CFexpress Type B cards and you need fast, reliable storage for high-bitrate video or rapid bursts. Its 1700 MB/s rating puts it in the performance class that suits 8K and heavy raw shooting, but check your camera's card slot before buying.

What the 1700 MB/s figure actually tells you

The 1700 MB/s on the Delkin CFexpress POWER 128GB is a peak sequential read speed, which is the number manufacturers typically quote. In practice, your real-world transfer speeds will depend on your card reader, your computer's interface, and the file sizes you're moving. For video recording, the more important figure is sustained write speed, which isn't listed in the catalog data here. That's a limitation to keep in mind: if you're shooting very high-bitrate codecs, check the camera manufacturer's approved card list or test the card in your own workflow before relying on it for a paid shoot.

Why 128GB is a practical capacity for many shooters

128GB hits a useful middle ground. It's large enough to hold a substantial amount of 4K or 8K footage without constant offloading, yet small enough that you're not putting all your work on a single high-capacity card. For photographers, it comfortably covers a full day of raw bursts for most subjects. The trade-off is that 8K video can fill 128GB quickly, so plan your offload routine around the card's capacity rather than assuming you can shoot all day on one card.

Compatibility: what to check before you buy

CFexpress comes in different physical formats, and the Delkin CFexpress POWER 128GB is a Type B card. Not every camera with a CFexpress slot accepts Type B; some use Type A or SD. Before ordering, confirm your camera's slot type in its manual or spec sheet. Also check whether your camera has a firmware update that adds CFexpress support, since some models gained compatibility after launch. If your camera only takes SD cards, this card won't fit, and you'd be better served by a high-speed SD card instead.

Is this card overkill for your needs?

If you shoot mostly JPEGs, casual video, or work that doesn't demand fast continuous writes, a premium CFexpress card like this one may be more than you need. The extra speed and rugged build matter most for professional video, high-resolution raw bursts, and workflows where offload time directly affects your day. For lighter use, a standard SD card can be perfectly adequate and less expensive. The Delkin card makes the most sense when your camera can actually take advantage of its performance.

Frequently asked questions

Is the Delkin CFexpress POWER 128GB fast enough for 8K video?

Its 1700 MB/s read speed is in the range used by cards marketed for high-end cinematic cameras, but the catalog doesn't list a sustained write speed. For 8K, check your camera's approved media list and test the card with your specific codec before a critical shoot. Don't assume read speed alone guarantees 8K compatibility; verify with your camera's requirements.

Which cameras does this card work with?

It's a CFexpress Type B card, so it fits cameras with a Type B slot. That includes many recent full-frame mirrorless and cinema models, but not cameras that use CFexpress Type A or SD only. Confirm your camera's slot type and any firmware requirements first. Check your camera manual for 'CFexpress Type B' before ordering.

Do I need a special reader to offload this card?

Yes, you'll need a CFexpress Type B card reader or a camera with direct USB transfer. A standard SD reader won't work. Using a compatible reader with a fast connection (like USB 3.2 or Thunderbolt) helps you get closer to the card's rated speeds. Budget for a Type B reader if you don't already own one.

How many photos or how much video can 128GB hold?

That depends entirely on your file sizes and bitrates. As a rough guide, 128GB holds roughly 1,600 24MP raw files at about 80MB each, or around 20 minutes of 8K video at 400 Mbps. Use your camera's estimated remaining shots or recording time display for a precise figure. Estimate your own file sizes to judge whether 128GB covers a full shoot.

Is this card worth the price compared to a standard SD card?

Only if your camera supports CFexpress Type B and you need the extra speed for high-bitrate video or fast continuous raw shooting. For everyday photography and casual video, a good SD card is usually sufficient and costs less. Match the card's capability to your actual shooting demands.

Product facts