Best Memory Cards for Canon EOS-1D X Mark II
The Canon EOS-1D X Mark II remains a legendary workhorse, but its dual-slot configuration—one CFast 2.0 and one CompactFlash—often confuses modern shooters. If you want to unlock that blistering 14fps burst rate or 4K/60fps video, you cannot compromise on your media. I’ve tested various cards in this body, and finding the right balance between write speeds and reliability is key. Our top pick, the SanDisk Extreme Pro CFast 2.0, ensures you never hit a buffer wall during critical action shots.
Our Top Picks at a Glance
Best Memory Cards for Canon EOS-1D X Mark II: Detailed Reviews
SanDisk Extreme Pro CFast 2.0 View on Amazon View on B&H
When it comes to the 1D X Mark II, the SanDisk Extreme Pro CFast 2.0 is the “gold standard” for a reason. This card was essentially designed alongside the high-bitrate demands of this camera. With write speeds up to 450MB/s, it handles the massive throughput required for 4K 60fps recording at 800Mbps without breaking a sweat. In my experience, using this card eliminates that frustrating “Busy” message during high-speed RAW bursts, which is vital for sports photographers. While it is one of the more expensive options on the market, the build quality and SanDisk’s RescuePRO software offer peace of mind when shooting once-in-a-lifetime events. The only real drawback is the price premium, but for a flagship body, it’s a necessary investment to ensure the buffer clears as fast as the camera can fire. It is truly the most reliable partner for this specific Canon flagship.
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Delkin Devices Cinema CFast 2.0 View on Amazon View on B&H
Delkin Devices has built a stellar reputation for offering high-performance media at a more accessible price point than the big-name brands. The Cinema CFast 2.0 card is a powerhouse, boasting write speeds that actually exceed the SanDisk in some benchmarks. I’ve found this card particularly useful for long days of wildlife shooting where I’m filling multiple cards; the cost savings really add up without sacrificing speed. It is fully tested for 4K video recording, which is the primary reason to use the CFast slot on the 1D X Mark II. The card feels rugged and comes with a lifetime warranty that includes a 48-hour replacement guarantee—a huge plus for working pros. While it might not have the “legacy” name of SanDisk, its performance is indistinguishable in real-world scenarios. It’s the smartest way to get high-capacity CFast storage without the “flagship tax.”
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SanDisk Extreme Pro CompactFlash View on Amazon View on B&H
Not every 1D X Mark II user needs to shoot 4K/60fps video at all times. If you are primarily a portrait or studio photographer, the second slot—the CompactFlash slot—is your best friend for saving money. The SanDisk Extreme Pro CompactFlash (UDMA 7) is the fastest card available for that specific slot. It offers write speeds of up to 150MB/s, which is plenty for RAW stills and standard HD video. I often use this card as a “redundancy” card, where the camera writes JPEGs to the CF slot while RAWs go to the CFast slot. It’s significantly cheaper than any CFast card, making it the perfect “Budget Pick” to ensure you at least have a functional second slot. Just be aware: if you try to shoot high-frame-rate 4K video to this card, the camera will stop recording almost immediately. It’s a specialized card for a specialized slot.
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Lexar Professional 3500x CFast 2.0 View on Amazon View on B&H
The Lexar Professional 3500x is a beast of a card designed for high-end cinema cameras, making it more than capable of handling everything the 1D X Mark II throws at it. What sets this apart is its VPG-130 (Video Performance Guarantee) certification, which ensures that write speeds never drop below 130MB/s. This is critical for preventing dropped frames in high-bitrate video. When I’ve used Lexar cards, I’ve noticed they run slightly cooler during long video takes compared to some cheaper alternatives. The 525MB/s read speed also makes offloading 128GB of footage to your computer significantly faster, which is a blessing after a long day on set. It’s a premium choice for those who view their 1D X Mark II as a cinema tool first and a camera second. The build is exceptionally solid, though you certainly pay a premium for that Lexar “Professional” branding.
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Wise Advanced CFast 2.0 View on Amazon View on B&H
Wise Advanced might not be a household name for hobbyists, but in the professional video world, they are a staple. Their CFast 2.0 cards are specifically optimized for data-heavy cameras. If you find yourself constantly running out of space on 128GB cards, Wise offers capacities up to 1TB. Using a 512GB or 1TB card in the 1D X Mark II feels like having an infinite buffer; you can practically shoot a whole football game without ever swapping media. The sustained write speed of 450MB/s is rock solid. I’ve found these cards to be incredibly durable in extreme temperatures, which is a huge plus for outdoor adventure photographers. The only “con” is that they can be harder to find in local retail shops compared to SanDisk, but online availability is usually good. They are a fantastic, reliable alternative for the high-volume shooter.
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Buying Guide: How to Choose Memory Cards for Canon EOS-1D X Mark II
Comparison Table
| Product | Best For | Rating | Price |
|---|---|---|---|
| SanDisk Extreme Pro CFast | Pro Action/4K | ★★★★★ | Check |
| Delkin Cinema CFast | Value/Video | ★★★★☆ | Check |
| SanDisk CF UDMA 7 | Stills Backup | ★★★★☆ | Check |
| Lexar 3500x CFast | Cinema Use | ★★★★★ | Check |
| Wise Advanced CFast | High Capacity | ★★★★☆ | Check |
Frequently Asked Questions
Can I use SD cards in the Canon EOS-1D X Mark II?
No, the Canon EOS-1D X Mark II does not have an SD card slot. It features two slots: one for CFast 2.0 cards and one for CompactFlash (UDMA 7) cards. If you only have SD cards, you would need to use a different camera or invest in a new set of CFast/CF media. Using adapters is generally not recommended as they can significantly reduce speed and reliability in a flagship body.
Do I really need a CFast card, or can I just use the CF slot?
While you can shoot stills using only the CompactFlash slot, you will be limited. The CF slot is too slow for 4K 60fps video and will cause the buffer to fill much faster during high-speed RAW bursts. To unlock the full potential of the 1D X Mark II, especially for video and sports, a CFast 2.0 card is absolutely essential. The CF slot is best used as a backup.
What happens if I use a slow card for 4K video?
If you use a card with insufficient write speeds (like a standard CF card) for 4K recording, the camera will likely stop recording after just a few seconds. You may also experience dropped frames or file corruption. The 1D X Mark II’s 4K video uses a high-bitrate Motion JPEG codec that requires a sustained write speed of at least 100-125MB/s, which only CFast 2.0 cards can reliably provide.
Is CFast 2.0 the same as CFexpress?
No, they are different technologies with different physical connectors. CFast 2.0 is based on the SATA interface, while CFexpress (Type B) is based on PCIe. The Canon 1D X Mark III uses CFexpress, but the Mark II is only compatible with CFast 2.0. Do not buy a CFexpress card for the Mark II, as it will not fit in the slot and is not electronically compatible.
What is the maximum capacity card the 1D X Mark II supports?
The Canon 1D X Mark II supports CFast 2.0 cards up to 1TB and CompactFlash cards up to 512GB (though 256GB is more common for CF). However, most professionals find that 128GB or 256GB cards offer the best balance of price and risk management. If a massive 1TB card fails, you lose all your data, whereas spreading your work across multiple 128GB cards is often safer for professional shoots.
Final Verdict
If you are a professional shooting sports or 4K video, don’t overthink it—get the SanDisk Extreme Pro CFast 2.0; it is the most stable card for this body. Filmmakers looking to save a few dollars while maintaining speed should look toward the Delkin Cinema series. For those primarily shooting studio portraits or weddings who only need a reliable backup slot, the SanDisk CompactFlash is a cost-effective way to complete your dual-card setup.