Best Memory Cards for Canon EOS R5
The Canon EOS R5 is a beast of a machine, but its 45MP bursts and 8K RAW video demands can bring a standard memory card to its knees. If you’ve ever seen the dreaded “busy” signal during a shoot, you know the frustration. After testing dozens of options in real-world wildlife and wedding scenarios, I’ve found that the Delkin Devices BLACK CFexpress is the gold standard for this body. Here is how to navigate the dual slots and maximize your performance.
Our Top Picks at a Glance
Best Memory Cards for Canon EOS R5: Detailed Reviews
Delkin Devices BLACK CFexpress Type B View on Amazon View on B&H
If you are pushing your Canon R5 to its limits—specifically when shooting 8K RAW or 4K/120fps—the Delkin BLACK is the only card I trust implicitly. Unlike many cards that boast high “peak” speeds but throttle down under heat, the BLACK series maintains a sustained write speed of 1530MB/s. I’ve found this keeps the buffer clear even when firing off 20fps electronic shutter bursts of a bird in flight. It’s built like a tank and is serialized for extra security. The real kicker is Delkin’s “48-Hour Replacement” warranty; they’ll ship you a new card before you even send the broken one back. It is significantly more expensive than consumer-grade cards, but for mission-critical work where a “Card Error” is not an option, it is worth every penny of the premium price tag.
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ProGrade Digital CFexpress Type B Gold View on Amazon View on B&H
For the majority of R5 owners who aren’t shooting 8K RAW every single day, the ProGrade Gold series offers a fantastic price-to-performance ratio. During my testing, these cards handled 4K/60fps and long sequences of 45MP RAW files without a hitch. While it doesn’t quite match the sustained write speed of the Cobalt or Delkin BLACK lines, it rarely hits a bottleneck in standard professional use. You’ll notice the card gets a bit warm during heavy use, but it remains within safe operating limits. I particularly appreciate the “Refresh Pro” software compatibility, which allows you to check the health of your card’s flash memory. It’s a smart middle-ground choice that gives you CFexpress speeds for high-speed photography without the “professional cinema” price tag that usually accompanies these cards. A very solid workhorse for daily assignments.
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SanDisk Extreme Pro UHS-II SD View on Amazon View on B&H
Let’s be honest: the R5’s SD slot is its “safety net.” While you can’t record 8K video to an SD card, a high-quality V90 UHS-II card like the SanDisk Extreme Pro is essential for dual-slot recording. I always set my R5 to record RAW to the CFexpress and JPEG to this SD card. It’s incredibly reliable and widely available. The limitation is obvious: if you try to record high-bitrate video or clear a massive burst of RAW images to this slot, you will be waiting for several seconds as the buffer empties. However, for portrait photographers or landscape shooters who don’t need 20fps speeds, this card is a cost-effective way to utilize the second slot. SanDisk’s reputation for durability is well-earned here, making it a “must-have” secondary card in your bag.
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Angelbird AV PRO CFexpress B MK2 View on Amazon View on B&H
When you are shooting 8K on the R5, you don’t just need speed—you need massive capacity. A 128GB card will fill up in mere minutes. The Angelbird AV PRO MK2 is designed for the long haul, offering capacities up to 4TB. What I love about Angelbird is their focus on stable stream recording; this card is specifically engineered to prevent dropped frames in high-data-rate video. It’s also built to handle the heat that the R5 generates during long video takes. While the initial investment is steep, it is actually one of the most cost-effective cards when you calculate the price per gigabyte at higher capacities. If you are a documentary filmmaker or someone who hates swapping cards mid-shoot, this is the professional’s choice for deep storage and uncompromised speed.
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ProGrade Digital CFexpress Type B Cobalt View on Amazon View on B&H
The ProGrade Cobalt is the high-performance sibling to the Gold series. What makes it “Also Great” (and often preferred by sports shooters) is its use of SLC memory. This type of flash is more durable and maintains high speeds even when the card is nearly full. In my experience, some cards start to slow down once you’ve used 80% of the capacity—not the Cobalt. It maintains a minimum sustained write speed of 1400MB/s, making it a reliable partner for the R5’s 20fps burst mode. The only reason it isn’t my “Best Overall” is that it’s often hard to find in stock and usually commands a higher price than the Delkin BLACK for similar performance. If you find a deal on it, grab it; it’s one of the most reliable cards ever made for the Canon RF system.
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Buying Guide: How to Choose Memory Cards for the Canon R5
Comparison Table
| Product | Best For | Rating | Price |
|---|---|---|---|
| Delkin BLACK | 8K Video & Action | ★★★★★ | Check |
| ProGrade Gold | General Pro Use | ★★★★☆ | Check |
| SanDisk Extreme Pro | Stills Backup | ★★★★☆ | Check |
| Angelbird AV PRO | Long Cinema Takes | ★★★★★ | Check |
| ProGrade Cobalt | Wildlife/Sports | ★★★★☆ | Check |
Frequently Asked Questions
Do I really need CFexpress for the Canon R5?
If you want to use the R5’s most advanced features like 8K video or 20fps RAW bursts, yes. A standard SD card simply isn’t fast enough to handle the data throughput. While the camera will take photos with just an SD card, you will experience significant “lag” while the buffer clears, and most high-end video modes will be grayed out in the menu. CFexpress is the key to unlocking the R5’s power.
Can I use a UHS-I SD card in the second slot?
Technically, yes, but I wouldn’t recommend it. UHS-I cards are much slower (approx. 95MB/s) than UHS-II cards (approx. 300MB/s). If you set your camera to “Record to Multiple” for backup, the R5 will slow down to match the speed of the slowest card. Using a UHS-I card will make your high-performance R5 feel like a camera from 2010. Always stick to UHS-II for the SD slot.
Why does my 8K video stop recording after a few seconds?
This is almost always due to the “Sustained Write Speed” of your memory card. Many cards advertise “Peak Speeds” of 1700MB/s, but their sustained speed drops below 400MB/s once they get warm or the cache fills up. 8K RAW requires a constant, high-speed stream of data. If the card can’t keep up, the camera stops recording to protect the file integrity. Look for VPG-400 or higher rated cards.
Does the memory card brand affect R5 overheating?
While the card isn’t the primary cause of the R5’s famous heat issues, it does play a role. Some CFexpress cards run significantly hotter than others during data transfer. High-end cards like the Delkin BLACK or ProGrade Cobalt are designed with better thermal management. Using a high-quality card can help marginally extend your recording times by preventing the card slot area from becoming an additional heat source for the sensor.
What is the difference between CFexpress Type A and Type B?
The Canon R5 uses **Type B**. Type B cards are larger and much faster than Type A cards (which are primarily used by Sony). You cannot fit a Type A card into the R5, and they are not cross-compatible. Type B cards use two PCIe lanes, allowing for speeds up to 2000MB/s, which is exactly what the R5 needs to handle its massive 8K video files and high-resolution bursts.
Final Verdict
For the professional who demands the absolute best, the Delkin BLACK is the clear winner for its sustained speeds and rugged build. If you are an enthusiast primarily shooting stills or 4K video, the ProGrade Gold will save you money without sacrificing noticeable performance. Regardless of your choice, I highly recommend pairing your CFexpress card with a SanDisk UHS-II SD card in the second slot to ensure you always have a reliable backup of your precious files.