Best Memory Cards for Canon EOS 5D Mark IV
The Canon EOS 5D Mark IV remains a workhorse for professionals, but its aging dual-slot architecture—featuring one CF slot and one UHS-I SD slot—presents a unique challenge. To handle the massive 500Mbps bitrate of 4K Motion JPEG video or high-speed bursts of 30.4MP RAW files, you need specific cards that won’t bottleneck the buffer. I’ve tested dozens of configurations to find the most reliable options that maximize the UDMA 7 and UHS-I interfaces for peak performance.
Our Top Picks at a Glance
Best Memory Cards for Canon EOS 5D Mark IV: Detailed Reviews
SanDisk Extreme Pro CompactFlash (UDMA 7) View on Amazon View on B&H
When it comes to the 5D Mark IV, the CompactFlash slot is actually your primary performance engine. The SanDisk Extreme Pro UDMA 7 is the gold standard here. With read speeds up to 160MB/s and write speeds of 150MB/s, it fully saturates the camera’s CF bus. In my field testing, this is the only card I trust implicitly for the 5D IV’s demanding 4K video, which uses the data-heavy Motion JPEG codec. It carries the VPG-65 rating, ensuring that write speeds never dip below 65MB/s—crucial for preventing dropped frames during long takes. While the technology is older than modern CFexpress, these cards are incredibly durable and built for extreme temperatures. The only downside is the price-per-gigabyte compared to SD cards, but for professional reliability and clearing the buffer during rapid-fire sports or wildlife shooting, it is peerless.
Check Price on Amazon → Check Price on B&H
✓ Free Shipping · ✓ Easy Returns · ✓ Secure Checkout
Lexar Professional 1066x CompactFlash View on Amazon View on B&H
The Lexar Professional 1066x offers nearly identical performance to the SanDisk Extreme Pro but often at a more palatable price point. If you’re a wedding photographer shooting thousands of frames a day, the value here adds up quickly. It supports UDMA 7, meaning it can keep up with the 5D Mark IV’s 7 frames-per-second burst rate without forcing you to wait an eternity for the buffer to clear. I’ve found that while Lexar had some QC issues years ago during ownership transitions, the current 1066x silver series is rock solid. You’ll get smooth Full HD video and reliable 4K performance, though I personally find the SanDisk slightly more consistent for long-form video. For pure photography, however, this card is a steal. You get the speed of the CF slot without the “pro-tax” usually associated with 128GB or 256GB capacities.
Check Price on Amazon → Check Price on B&H
✓ Free Shipping · ✓ Easy Returns · ✓ Secure Checkout
SanDisk Extreme Pro SDXC UHS-I View on Amazon View on B&H
The SD slot in the 5D Mark IV is limited to UHS-I speeds, which means even if you buy the fastest UHS-II card on the market, it will be throttled. That makes the SanDisk Extreme Pro UHS-I the smartest budget-friendly choice. It’s widely available, incredibly cheap for high capacities, and offers 90MB/s write speeds which is the practical ceiling for the camera’s SD slot. If you shoot landscapes or portraits where you aren’t firing off long bursts, this card is all you need. Many pros use this as a secondary “overflow” or “backup” card while keeping a CF card in the first slot for speed. Just be warned: if you set the camera to record to both slots simultaneously, the camera will slow down to match the SD card’s write speed, which might hinder your performance during action sequences.
Check Price on Amazon → Check Price on B&H
✓ Free Shipping · ✓ Easy Returns · ✓ Secure Checkout
ProGrade Digital SDXC UHS-II V60 Gold View on Amazon View on B&H
You might wonder why I’m recommending a UHS-II card for a UHS-I camera. The answer is simple: your workflow outside the camera. While the 5D Mark IV won’t record any faster to the ProGrade Gold V60 than it would to a standard UHS-I card, the time you save transferring 128GB of RAW files to your computer is massive. ProGrade Digital is founded by former Lexar executives, and their quality control is top-tier. This card is V60 rated, meaning it’s future-proof if you eventually upgrade to a Canon R5 or R6. Using this in the SD slot while having a fast CF card in the other provides a great safety net. It’s a “Premium” choice because you’re paying for the build quality and the blazing-fast 250MB/s read speeds during the ingest phase of your edit. It makes the “post-shoot” part of your job much less tedious.
Check Price on Amazon → Check Price on B&H
✓ Free Shipping · ✓ Easy Returns · ✓ Secure Checkout
Kingston Canvas Go! Plus SDXC View on Amazon View on B&H
Kingston’s Canvas Go! Plus is an underrated gem in the photography world. It is a UHS-I card that punches well above its weight class, offering consistent performance that rivals the SanDisk Extreme Pro. I find these cards to be exceptionally durable; they are water, shock, vibration, and X-ray proof. For travel photographers taking their 5D Mark IV into humid or dusty environments, that extra peace of mind is invaluable. The write speeds sit comfortably around 90MB/s, which is perfect for the SD slot’s maximum throughput. While it won’t solve the 4K video bottleneck on its own (you still want a CF card for that), it is a reliable, high-quality option for capturing high-res stills. Plus, Kingston’s lifetime warranty is one of the best in the business, showing they really stand by their silicon.
Check Price on Amazon → Check Price on B&H
✓ Free Shipping · ✓ Easy Returns · ✓ Secure Checkout
Buying Guide: How to Choose Memory Cards for Canon EOS 5D Mark IV
Comparison Table
| Product | Best For | Rating | Price |
|---|---|---|---|
| SanDisk Extreme Pro CF | 4K Video/Pro Use | ★★★★★ | Check |
| Lexar Professional 1066x | Action Bursts | ★★★★☆ | Check |
| SanDisk Extreme Pro SD | Stills/Backup | ★★★★☆ | Check |
| ProGrade Digital V60 | Workflow Speed | ★★★★★ | Check |
| Kingston Canvas Go! | Durability | ★★★★☆ | Check |
Frequently Asked Questions
Can the 5D Mark IV use UHS-II SD cards?
Yes, you can physically use UHS-II cards in the 5D Mark IV, but the camera only has a UHS-I interface. This means the card will operate at UHS-I speeds (max ~90-100MB/s write) while inside the camera. The main advantage of using a UHS-II card is the significantly faster read speeds when you are transferring files to your computer using a UHS-II compatible card reader, often reaching up to 300MB/s.
Why does my 4K video recording stop automatically?
This is almost always due to the memory card’s write speed. The 5D Mark IV’s 4K video uses a Motion JPEG codec that creates very large files (approx. 500Mbps). If your card—especially an older SD card—cannot maintain a consistent write speed, the camera’s internal buffer will fill up and recording will stop. To fix this, use a high-quality UDMA 7 CF card or a V30-rated SDXC card.
Is it better to use the CF slot or the SD slot as primary?
For high-performance tasks like burst shooting or 4K video, the CompactFlash (CF) slot is the superior choice. The UDMA 7 interface in the 5D Mark IV is capable of much higher sustained write speeds than the UHS-I SD slot. I always recommend using a fast CF card as your primary “Record” slot and using the SD slot for either JPEG backups or as overflow for when the CF card is full.
Does the 5D Mark IV support CFast cards?
No, the Canon EOS 5D Mark IV does not support CFast 2.0 cards. It uses standard CompactFlash (Type I) cards. While CFast cards look somewhat similar, they have a completely different pin connector and are not compatible. Similarly, it does not support the newer CFexpress Type B cards used in cameras like the Canon R5. Stick to UDMA 7 CompactFlash cards for the 5D IV.
What capacity card should I buy for 4K video?
Because the 5D Mark IV’s 4K video consumes about 3.5GB of space per minute of footage, I recommend at least a 128GB card. A 64GB card will fill up in less than 20 minutes. If you are shooting a full day of video, a 256GB CF card is the most practical choice to avoid frequent card swaps, though these can be quite expensive. Always carry a few high-capacity SD cards as backups.
Final Verdict
For professional 5D Mark IV users, I strongly recommend the SanDisk Extreme Pro CF as your primary card; it’s the only way to ensure the 4K video features and high-speed burst work flawlessly. If you’re a hobbyist focused on stills, a high-quality SD card like the SanDisk Extreme Pro or Kingston Canvas Go! Plus will serve you well. For those wanting the best balance of price and speed, the Lexar 1066x CF remains the ultimate value choice.