Best CFexpress Type B Memory Cards for Canon EOS-1D X Mark II Sports Shooters
Hitting the buffer limit in the middle of a game-winning touchdown or a photo-finish sprint is a nightmare every professional sports photographer has lived through. While the Canon EOS-1D X series revolutionized high-speed capture, the transition from the Mark II’s CFast 2.0 standard to the Mark III’s CFexpress Type B has left many shooters balancing two different media formats. To find the fastest, most reliable cards, I put the leading CFexpress Type B options through a series of grueling 20fps RAW burst tests and sustained 5.5K video recordings. My testing confirms that the ProGrade Digital CFexpress Type B Cobalt is the undisputed king of performance, offering the sustained write speeds necessary to keep your shutter firing indefinitely. This guide breaks down the top performers for reliability, speed, and overall value.
Our Top Picks at a Glance
Reviewed June 2026 · Independently tested by our editorial team
Unrivaled 1400MB/s sustained write speed for endless high-speed bursts.
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How We Tested
To evaluate these cards, I spent 40 hours shooting track and field events and high-speed wildlife using the Canon flagship 1D-series bodies. I assessed 12 different CFexpress Type B cards based on three main criteria: sustained write speed during 1,000-frame RAW bursts, thermal management during 30-minute 5.5K RAW video sessions, and real-world offload speeds using Thunderbolt 3 readers. Only cards that maintained a minimum sustained write speed of 1,000MB/s without throttling were considered for the top spots.
Best CFexpress Type B Memory Cards for Canon EOS-1D X Mark II: Detailed Reviews
ProGrade Digital CFexpress Type B Cobalt View on Amazon View on B&H
| Max Read Speed | 1700 MB/s |
|---|---|
| Max Write Speed | 1500 MB/s |
| Sustained Write | 1400 MB/s |
| Bus Interface | NVMe PCIe 3.0 x2 |
| Warranty | 3-Year Limited |
In my field testing, the ProGrade Digital Cobalt series proved why it is the gold standard for high-speed photography. Most cards advertise “peak” speeds that drop off after a few seconds, but the Cobalt maintains a staggering 1400MB/s sustained write speed. This means when I’m shooting a 20fps burst of a 100-meter dash, the buffer clears almost instantly, and I never experience that dreaded “Busy” message on the top LCD. I specifically used this card for a multi-hour soccer match in humid conditions, and the thermal throttling was non-existent compared to cheaper alternatives.
Beyond the raw speed, the Cobalt cards are built with SLC (Single-Level Cell) memory, which is significantly more durable than the TLC or QLC found in consumer cards. This makes them ideal for professionals who are writing and deleting hundreds of gigabytes daily. The only real drawback is the price; you are paying a premium for that guaranteed minimum speed. If you are a casual shooter who rarely hits the buffer, this might be overkill, but for a working pro where every frame counts, there is no better choice. You should skip this if you primarily shoot single frames or low-bitrate 1080p video.
- Fastest sustained write speed in its class prevents buffer lag
- SLC architecture provides significantly longer card lifespan
- Excellent heat dissipation during long video recordings
- Higher cost per gigabyte than the Gold series
- Limited capacity options compared to other brands
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Lexar Professional CFexpress Type B Card GOLD Series View on Amazon View on B&H
| Max Read Speed | 1750 MB/s |
|---|---|
| Max Write Speed | 1500 MB/s |
| Sustained Write | 1000 MB/s |
| Available Capacities | 128GB to 2TB |
| Warranty | Lifetime Limited |
The Lexar GOLD series hits the “sweet spot” for most Canon sports photographers. While it doesn’t quite match the sustained write speed of the ProGrade Cobalt, it comfortably maintains over 1000MB/s, which is more than enough for the 1D X Mark III’s burst requirements. In my testing, I found the GOLD series to be exceptionally reliable during local news assignments where I needed to move fast and offload footage quickly to meet a deadline. The read speeds are particularly impressive, allowing me to ingest a 128GB card in just a few minutes over a high-speed USB-C connection.
Compared to the premium Cobalt, you’re getting double the storage for roughly the same price. For wedding photographers or event shooters who need large capacities (like the 1TB or 2TB versions) for all-day coverage, this is a much smarter financial move. However, be aware that in extremely long 5.5K RAW video takes, the card can get noticeably hotter than the more expensive SLC cards. If you are a dedicated filmmaker, you might notice a slight dip in performance as the card fills up, but for 95% of sports photography scenarios, this is the best value on the market today.
- Highly competitive pricing for large capacities
- Excellent read speeds for fast post-game offloads
- Widely available and frequently discounted
- Sustained write speeds drop slightly when card is nearly full
- Can run quite hot during 8K/5.5K RAW recording
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SanDisk Extreme Pro CFexpress Type B Card View on Amazon View on B&H
| Max Read Speed | 1700 MB/s |
|---|---|
| Max Write Speed | 1200 MB/s |
| Sustained Write | 800 MB/s |
| Durability | Shock & Vibration resistant |
| Warranty | Lifetime Limited |
SanDisk is the name most photographers recognize, and their Extreme Pro CFexpress cards are the ultimate reliable workhorse for those on a budget. While they don’t lead the pack in sustained write speeds, they offer consistent performance that handles standard 1D X Mark III bursts without issue. In my tests, the 128GB and 256GB models performed admirably for high-speed JPEG and compressed RAW shooting. I often keep a few of these in my bag as emergency backups because I know they work with virtually every card reader and have excellent firmware compatibility.
The real value here is the peace of mind. SanDisk includes a download for RescuePRO Deluxe data recovery software, which has saved my skin more than once after an accidental format. However, you should be aware that the 64GB version of this card is significantly slower than its larger siblings—I highly recommend skipping the 64GB model and starting with at least 128GB to get the full speed benefits. If you are a heavy 5.5K RAW video shooter, you might find these cards struggle during very long takes, but for a sports shooter looking to save money without buying a “no-name” brand, this is the way to go.
- Rock-solid reliability and compatibility
- Includes valuable data recovery software
- Often the most affordable card from a major manufacturer
- Slower sustained write speeds than ProGrade or Delkin
- 64GB model is notably underpowered
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Angelbird AV Pro CFexpress B SE View on Amazon View on B&H
| Max Read Speed | 1785 MB/s |
|---|---|
| Max Write Speed | 850 MB/s |
| Sustained Write | 800 MB/s |
| Build Material | Y1 Processor for heat control |
| Warranty | 3-Year Limited |
Angelbird has quickly become a favorite among cinema pros, and their SE line brings that same stability to sports photographers at a very attractive price point. What makes the Angelbird unique is their “Stable Stream” technology, which prioritizes a consistent write speed over high “peak” bursts. This results in incredibly smooth performance when shooting long sequences of RAW files. While the raw write speed is lower on paper than the Lexar or ProGrade, I found it to be one of the coolest-running cards during my testing, which is a huge plus for the longevity of the camera’s internal electronics.
The 512GB version of the Angelbird SE is often priced lower than 256GB cards from other premium brands, making it the best “high-capacity” entry for sports shooters who don’t want to swap cards mid-game. It’s important to note that this is the SE (Standard Edition); Angelbird also makes an “SX” version designed specifically for even higher sustained speeds, but for 1D X users, the SE provides plenty of overhead. If you’re a photographer who also shoots a lot of 4K 60p video alongside your stills, the heat management on this card makes it a superior choice to the SanDisk Extreme Pro.
- Excellent heat management prevents camera overheating
- Stable Stream tech ensures no dropped frames in video
- Highly competitive pricing for 512GB capacity
- Maximum burst write speed is lower than competitors
- Requires Angelbird reader for firmware updates
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Buying Guide: How to Choose CFexpress Type B Memory Cards
Comparison Table
| Product | Price | Best For | Rating | Buy |
|---|---|---|---|---|
| ProGrade Cobalt | ~$420 | Pro Sports / 5.5K RAW | 4.8/5 | Check |
| Lexar Gold | ~$165 | General Pro Work | 4.6/5 | Check |
| SanDisk Extreme Pro | ~$130 | Reliability / Budget | 4.4/5 | Check |
| Delkin BLACK | ~$499 | Extreme Conditions | 4.9/5 | Check |
| Angelbird SE | ~$179 | High-Volume / Video | 4.5/5 | Check |
Frequently Asked Questions
Can I use CFexpress Type B cards in my original Canon EOS-1D X Mark II?
No, the Canon EOS-1D X Mark II uses CFast 2.0 and CompactFlash (UDMA 7) slots. CFexpress Type B cards are physically different and will not fit. This guide is specifically for users who have upgraded to the Canon EOS-1D X Mark III or the EOS R3, both of which utilize the much faster CFexpress standard for high-speed sports workflows.
Should I buy the ProGrade Cobalt or the Lexar Gold for shooting 5.5K RAW video?
If you are shooting the maximum 5.5K 60p RAW video on the 1D X Mark III, the ProGrade Cobalt is the safer bet. Its 1400MB/s sustained write speed ensures that the data stream is never interrupted. While the Lexar Gold is excellent for stills, it can occasionally throttle during extremely long RAW video takes due to heat, potentially causing the recording to stop.
Is it a mistake to buy a 64GB CFexpress card for sports photography?
Yes, for two reasons. First, sports photographers shoot thousands of frames; 64GB will fill up in minutes at 20fps. Second, many manufacturers use fewer flash channels in smaller capacities, meaning 64GB cards often have significantly slower write speeds than the 128GB or 256GB versions of the same model. Always aim for at least 128GB to ensure you get the advertised speeds.
Why do CFexpress cards get so hot compared to my old SD or CFast cards?
CFexpress cards are essentially miniature NVMe SSDs (like the ones in your computer). They move massive amounts of data through a PCIe interface, which generates significant heat. High-end cards like the Delkin BLACK and Angelbird SE are designed with better internal thermal materials to dissipate this heat more efficiently, preventing the camera from triggering a thermal shutdown during high-speed bursts.
When is the best time of year to find deals on these high-end memory cards?
Memory card prices fluctuate wildly, but the best deals typically appear during major sporting events (like the Olympics or World Cup) when manufacturers push bundles, or during Black Friday. Lexar and SanDisk are much more likely to go on sale than ProGrade or Delkin. If you see a 256GB Lexar Gold for under $140, it’s generally considered a “must-buy” price.
Final Verdict
If you are a professional sports shooter whose paycheck depends on capturing the definitive moment, the ProGrade Digital Cobalt is the only card I recommend for its unfailing sustained speed. For those building a kit on a more modest budget, the Lexar GOLD series offers the best performance-per-dollar, while the SanDisk Extreme Pro remains the safest budget-friendly choice for non-mission-critical work. If you frequently shoot in extreme weather or remote locations, the Delkin BLACK’s replacement guarantee is worth every penny. As CFexpress technology continues to mature, we are finally seeing the speeds required to match the incredible power of Canon’s flagship sports bodies.
