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Key Features
Compatibility
Product Description
CFexpress cards have a reputation problem. The numbers look great on the box, but the real-world sustained write speeds — the ones that actually matter when you're shooting a long burst sequence or recording high-bitrate video — often tell a different story. OWC takes a different approach: they test thoroughly, publish their actual results, and stand behind them. The Atlas Pro CFexpress 4.0 Type B delivers up to 3,650 MB/s read and 3,000 MB/s write at peak, with a sustained write floor of 800 MB/s. That's the number your camera sees when the buffer fills and the card has to keep up on its own.
The CFexpress 4.0 specification means this card runs on PCIe Gen 4 x2 — double the bandwidth lane of CFexpress 2.0 cards — which is what makes the speeds possible. It's also backward compatible with CFexpress 2.0 (PCIe Gen 3) cameras and readers that are in use today, and forward compatible with CFexpress 4.0 cameras and readers as they arrive. One card that works with what you have now and what you'll be shooting on in three years.
The Atlas Pro at 512GB sits in the sweet spot for professional photographers and video shooters who need serious capacity and speed without the premium of the Atlas Ultra. It handles fast burst RAW sequences, high-bitrate video up to 6K, and is compatible with a wide range of Canon, Nikon, Sony, Fujifilm, Panasonic, Leica, Phase One, RED, DJI and Blackmagic cameras. For XQD cameras that have been firmware-updated to support CFexpress Type B, it works there too. OWC's free Innergize app adds health monitoring, performance optimisation and field firmware upgrades — useful when a new camera body needs a card firmware update before it plays nicely.
- CFexpress 4.0 Type B — PCIe 4.0 x2 interface
- Up to 3,650 MB/s sequential read
- Up to 3,000 MB/s sequential write
- 800 MB/s sustained write speed
- 512GB capacity
- Backward compatible with CFexpress 2.0 (PCIe Gen 3) cameras and readers
- Supports high-bitrate video recording up to 6K
- Impact, bend, shock, ESD, UV ray and X-ray resistant
- Innergize enabled — health monitoring, performance optimisation, field firmware upgrades
- Compatible with updated XQD format cameras
- 3-year OWC limited warranty
What's in the Box
- OWC Atlas Pro CFexpress 4.0 Type B Memory Card (512GB)
- Jewel Case
- 3-Year OWC Limited Warranty
Product Q&A
Q: Is this card compatible with my Canon / Nikon / Sony / Fujifilm camera?
A: The Atlas Pro CFexpress 4.0 Type B is compatible with a wide range of professional cameras including Canon EOS R1, R3, R5, R5 Mark II, R5C, 1DX Mark III, C300 Mark III, C400, C500 Mark II; Nikon Z9, Z8, Z6 III, Z6 II, Z7 II, D500, D850, D5, D6; Sony Burano; Fujifilm X-H2, X-H2S, GFX100 II; Panasonic LUMIX S1, S1R, GH6, GH7; Leica SL3; Phase One, RED, DJI and selected Blackmagic cameras. Check OWC's compatibility table for your specific model and any limitations at the highest video resolution settings.
Q: What's the difference between Atlas Pro and Atlas Ultra?
A: Both cards share the same maximum sequential read (3,650 MB/s) and write (3,000 MB/s) speeds, and both use CFexpress 4.0. The key difference is sustained write speed — the Atlas Pro sustains 800 MB/s, while the Atlas Ultra sustains 1,500 MB/s. For photographers shooting fast RAW bursts and videographers up to 6K, the Atlas Pro is the cost-effective choice. For the most demanding cinema workflows and highest sustained throughput, the Atlas Ultra is the step up.
Q: Will this work with my CFexpress 2.0 camera or reader?
A: Yes. The Atlas Pro CFexpress 4.0 is backward compatible with CFexpress 2.0 (PCIe Gen 3) cameras and readers. You'll get the performance the host device supports — you won't get 4.0 speeds from a 2.0 device, but the card will function correctly and is forward compatible when you upgrade your equipment.
Q: What is OWC Innergize and do I need it?
A: Innergize is OWC's free companion app for Atlas memory cards. It monitors remaining write life so you know when a card is approaching end-of-life, sanitises flash memory to restore performance after heavy use, and provides field firmware upgrades for camera compatibility. You don't need it for the card to work, but it's a useful tool for professional workflows where reliability matters.
Q: Does it work with XQD cameras?
A: Yes, for cameras that have been firmware-updated by the manufacturer to support CFexpress Type B cards. Many Nikon XQD cameras (including the D500, D850, D5, D6) have received such updates. Check your camera manufacturer's website to confirm your specific model has the CFexpress Type B firmware update available.
Specifications
| Specification | Detail |
|---|---|
| Card Type | CFexpress Type B |
| Memory Card Specification | CFexpress 4.0 (backward compatible with CFexpress 1.0 and 2.0) |
| Interface | PCIe 4.0 x2 |
| Capacity | 512GB |
| Sequential Read (Max) | Up to 3,650 MB/s |
| Sequential Write (Max) | Up to 3,000 MB/s |
| Sustained Write | 800 MB/s |
| Innergize Enabled | Yes (health monitoring, performance optimisation, field firmware upgrades) |
| Durability | Impact, bend, shock, ESD, UV ray and X-ray resistant |
| Operating Temperature | -12°C to 72°C (10.4°F to 161.6°F) |
| Non-Operating Temperature | -20°C to 85°C (-4°F to 185°F) |
| Dimensions (LxWxH) | 39 x 30 x 4mm (1.5 x 1.2 x 0.1 in) |
| Warranty | 3-Year OWC Limited Warranty |
| SKU | OWCCFXB4P00512 |
| EAN | 810144629667 |
Compatibility
Fully Compatible Cameras (selected)
- Canon: EOS R1, R3, R5, R5 Mark II, R5C, R6 Mark III, 1DX Mark III, C50, C300 Mark III, C400, C500 Mark II
- Nikon: Z9, Z8, Z6 III, Z6 II, Z7 II, Z6, Z7, ZR, D500, D850, D5, D6
- Fujifilm: X-H2, X-H2S, GFX100 II, GFX ETERNA 55
- Panasonic: LUMIX GH6, GH7, S1, S1R, S1R II
- Leica: SL3
- Sony: Burano
- RED: KOMODO-X, V-RAPTOR, V-RAPTOR XL, V-RAPTOR XE
- DJI: Ronin 4D Cinema X9-6K, X9-8K
- Phase One: iXM-100, iXM-GS120, iXM-RS150F, iXM-RS250, iXM-RS280F, XC IQ4, XF IQ4, P5
Partially Compatible (not all video resolution settings)
- Blackmagic Pyxis 12K, URSA Cine
- Panasonic LUMIX S1II, S1IIE
- Sony Burano (compatible but camera may report "unsupported media")
Compatible Readers
- OWC Atlas FXR Thunderbolt + USB CFexpress Card Reader
- OWC Atlas USB4 CFexpress Card Reader
- OWC Atlas Dual CFexpress + SD Card Reader
- Any CFexpress Type B reader (CFexpress 2.0 or 4.0)
Note: Performance in CFexpress 2.0 readers and cameras is limited by the host device's PCIe Gen 3 bandwidth. For full 4.0 speeds, a CFexpress 4.0-capable reader or camera is required.
⚠️ Canon Notice: Select Canon camera users may experience issues powering on the device with inserted OWC Atlas Pro CFexpress Type B memory cards or other 3rd party memory cards. Please review the support article Canon Camera Power On Notice for more details.
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