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The Sony A7IV is a highly anticipated and versatile mirrorless camera that offers stunning image quality, fast autofocus, 4K video recording, and in-body image stabilization.
Last updated: April 2026
KEY TAKEAWAYS
- The Sony A7IV accepts CFexpress Type A cards in Slot 1 and UHS-II SD cards in both slots — choosing the right type for each slot directly affects burst and video performance.
- According to the SD Association (2017), V90 SD cards guarantee a minimum sustained write speed of 90 MB/s — sufficient for all A7IV video codecs — while CFexpress Type A cards reach up to 800 MB/s for the most demanding workflows.
- Capacity needs depend on shooting style: 64 GB suits casual photography, while 128 GB or more is recommended for professional 4K video sessions.
- CFexpress Type A delivers faster buffer clearing and higher sustained write speeds; UHS-II SD offers wider slot compatibility and lower cost per gigabyte.
- When using dual-slot simultaneous recording, the camera writes at the speed of the slower card — card pairing strategy matters as much as individual card choice.
However, to get the most out of your Sony A7IV, you need to pair it with the right memory card that suits your shooting style, budget, and expectations.
There are many memory cards available for Sony A7IV, ranging from SD cards to CFexpress cards, from UHS-I to UHS-II, from V30 to V90. How do you decide which one is the best for your needs?
In this guide, we will help you find the best memory card for Sony A7IV based on several factors such as speed, capacity, compatibility, and price.
What is Sony A7IV?
The Sony A7IV (definition: a full-frame mirrorless interchangeable-lens camera released by Sony in late 2021, using the E-mount system with a 33 MP BSI-CMOS sensor) is a full-frame mirrorless camera that uses Sony’s E-mount system, combining professional image quality with practical performance features designed for both stills and video work. It features a 1.0x crop factor, meaning lenses perform at their true focal lengths without multiplication.
The visual below illustrates the Sony A7IV’s black mirrorless body design, E-mount interface, and compact full-frame form factor.
Sony A7IV has an E-mount system that can accept both E and FE lenses. E lenses are designed for APS-C cameras and cover only a smaller portion of the sensor area. FE lenses are designed for full-frame cameras and cover the entire sensor area.
However, both E and FE lenses can be used on Sony A7IV, with some limitations. E lenses can be used normally without any cropping or vignetting. FE lenses can be used either in crop mode or full-frame mode.
In crop mode, the camera will use only the center part of the sensor that matches the APS-C size, which will result in lower resolution and narrower field of view. In full-frame mode, the camera will use the entire sensor area, but the image may have severe vignetting or dark corners.
What are Memory Cards?
Memory cards (definition: removable solid-state storage devices used by digital cameras to record images and video files) are small storage devices used to store images and videos captured by digital cameras, with different types optimized for different performance levels and compatibility with specific camera systems. For the Sony A7IV specifically, compatible cards include SD (UHS-II) and CFexpress Type A formats.
As shown in the following image, the physical differences between CFexpress Type A and UHS-II SD card formats illustrate why slot compatibility on the Sony A7IV varies between Slot 1 and Slot 2.
The most common types of memory cards for digital cameras are SD cards and CFexpress cards. SD cards (definition: Secure Digital cards — a compact flash storage standard governed by the SD Association) are small and thin cards that have a notch on one side and a lock switch on another side. CFexpress cards (definition: a next-generation card standard built on PCIe and NVMe protocols, available in Type A, B, and C form factors) are larger and thicker cards that have pins on one side and a groove on another side.
The most common sizes of memory cards for digital cameras are SDXC and SDHC. SDXC stands for Secure Digital eXtended Capacity and it can store up to 2TB of data. SDHC stands for Secure Digital High Capacity and it can store up to 32GB of data.
The most common speeds of memory cards for digital cameras are UHS-I and UHS-II. UHS stands for Ultra High Speed and it indicates the maximum bus speed of the card. UHS-I cards have a maximum bus speed of 104 MB/s while UHS-II cards have a theoretical maximum bus speed of 312 MB/s (SD Association, 2017).
The most common capacities of memory cards for digital cameras are 64GB, 128GB, 256GB, and 512GB. The capacity of a memory card indicates how much data it can store. The higher the capacity, the more images and videos you can store on the card.
How to Choose the Best Memory Card for Sony A7IV?
Choosing the best memory card for Sony A7IV requires evaluating card speed, capacity, compatibility, and budget to match your specific shooting needs. According to the SD Association (2017), V60 SD cards guarantee a minimum sustained write speed of 60 MB/s — sufficient for XAVC HS 4K using H.265 codecs — while V90 cards guarantee 90 MB/s of sustained write speed for higher-bitrate recording, making either a reliable baseline for 4K work on the A7IV.
Speed
The speed of a memory card determines how fast it can read and write data to and from the camera, directly impacting your ability to capture continuous bursts and sustained video. The speed of a memory card is measured in MB/s (megabytes per second) and it can range from 10 MB/s to 800 MB/s.
According to the CompactFlash Association (2019), CFexpress Type A cards are built on PCIe and NVMe protocols — the same technology used in high-speed computer SSDs — giving them a theoretical maximum of approximately 800 MB/s read and 700 MB/s write. This compares to the UHS-II SD theoretical maximum of 312 MB/s, making CFexpress the clear choice for the most demanding burst and video workflows.
In general, faster memory cards are good for high-resolution images and 4K video recording while slower memory cards are good for low-resolution images and HD video recording.
Capacity
The capacity of a memory card determines how much data it can store on the card, affecting shooting session duration and workflow efficiency. The capacity of a memory card is measured in GB (gigabytes) or TB (terabytes) and it can range from 8GB to 2TB.
Higher capacity memory cards are good for longer shooting sessions while lower capacity memory cards are good for shorter shooting sessions. Note that SD cards 32 GB and smaller use FAT32, which splits video files at 4 GB boundaries; cards 64 GB and larger use exFAT for seamless continuous recording (SD Association, 2017).
Compatibility
Compatibility determines whether a memory card will work properly with your Sony A7IV — Slot 1 accepts both CFexpress Type A and UHS-II SD cards, while Slot 2 accepts only UHS-II SD cards. The compatibility of a memory card depends on its type, size, speed, and format. Compatible memory cards are good for seamless performance while incompatible memory cards are good for nothing.
Price
The price of a memory card depends on its type, size, speed, capacity, and brand, with quality cards offering better reliability and longevity despite higher upfront costs. Professional-grade CFexpress cards typically cost more per gigabyte than UHS-II SD cards, though the performance gap justifies the premium for high-volume video and burst work. Cheaper memory cards are good for saving money while more expensive memory cards are good for getting better quality and peace of mind during critical shoots.
Best Memory Cards for Sony A7IV
Based on the factors above, here are some of the best memory cards for Sony A7IV that we recommend:
Sony TOUGH CFexpress Type A Card
Best for: Professional videographers, high-speed burst shooting, and demanding 4K workflows where maximum sustained performance is required.
The Sony TOUGH CFexpress Type A Card is one of the best CFexpress cards for Sony A7IV. It offers blazing-fast read speeds of up to 800 MB/s and write speeds of up to 700 MB/s, which are ideal for high-resolution images and 4K video recording. According to Sony Electronics (2023), the TOUGH G-Series is VPG400 certified — guaranteeing a minimum 400 MB/s sustained write speed — and carries an IP57 rating for dust and water-immersion resistance, with bend-proof construction rated to 70N and drop-proof protection from 5 meters.
It also has a tough and durable design that is waterproof, dustproof, shockproof, and temperature-resistant. It comes in two capacities: 80GB and 160GB.
This memory card is compatible with the card slot 1 of Sony A7IV, which supports both CFexpress Type A cards and UHS-II SD cards. It also comes with a USB Type-C reader that allows you to transfer data to your computer quickly and easily.
The Sony TOUGH CFexpress Type A Card is an excellent choice for anyone who wants a fast and reliable CFexpress card for their Sony A7IV.
SanDisk Extreme PRO UHS-II SD Card
Best for: Budget-conscious professionals, dual-slot redundancy workflows, and photographers who prefer the flexibility of SD card compatibility with both camera slots.
The SanDisk Extreme PRO UHS-II SD Card is one of the best UHS-II SD cards for Sony A7IV. It offers impressive read speeds of up to 300 MB/s and write speeds of up to 260 MB/s, which are suitable for high-resolution images and 4K video recording.
It also has a robust and resilient design that is waterproof, shockproof, x-ray-proof, and temperature-proof. It comes in various capacities: 32GB, 64GB, 128GB, and 256GB.
This SanDisk Extreme PRO SD Card is compatible with both card slots of Sony A7IV, which support UHS-II SD cards. It also comes with a UHS-II SD reader that allows you to transfer data to your computer efficiently and securely.
The SanDisk Extreme PRO UHS-II SD Card is a great choice for anyone who wants a high-performance and high-capacity UHS-II SD card for their Sony A7IV.
| Feature | Sony TOUGH CFexpress Type A | SanDisk Extreme PRO UHS-II SD |
|---|---|---|
| Type | CFexpress Type A | SDXC UHS-II |
| Read Speed | Up to 800 MB/s | Up to 300 MB/s |
| Write Speed | Up to 700 MB/s | Up to 260 MB/s |
| VPG Certification | VPG400 (min. 400 MB/s sustained) | V90 (min. 90 MB/s sustained) |
| Capacities | 80GB, 160GB | 32GB, 64GB, 128GB, 256GB |
| Compatible Slots (A7IV) | Slot 1 only (CFexpress/SD hybrid) | Both Slot 1 and Slot 2 |
| Video Performance | Excellent for all 4K codecs including All-Intra | V90: supports all 4K codecs; V60: sufficient for H.265 |
| Durability | IP57, 70N bend-proof, 5m drop-proof | Waterproof, shockproof, X-ray-proof |
| Dual-Slot Pairing Note | Simultaneous write defaults to slower card’s speed | Full speed available in both slots independently |
| Best Use Case | Professional video, burst shooting, demanding workflows | General use, redundancy setup, budget flexibility |
| Price Range (approx.) | $60–$120 per card | $25–$60 per card |
Frequently Asked Questions
Q: Can I use CFexpress cards in both slots of the Sony A7IV?
A: No — Slot 1 accepts both CFexpress Type A and UHS-II SD cards, while Slot 2 accepts only UHS-II SD cards. If you want CFexpress, you can only use it in Slot 1. This slot design means CFexpress Type A cards measure just 20 × 28 × 2.8 mm — compact enough to share a hybrid slot with SD cards (CompactFlash Association, 2019).
Q: What is the minimum card speed needed for 4K video on the Sony A7IV?
A: A V60 video speed class rating is the practical minimum for reliable 4K recording on the Sony A7IV. According to the SD Association (2017), V60 cards guarantee a minimum sustained write speed of 60 MB/s — sufficient for XAVC HS 4K using H.265 — while V90 cards guarantee 90 MB/s, supporting higher-bitrate All-Intra codecs with additional headroom. CFexpress Type A cards exceed all these requirements with their 700+ MB/s write speeds.
Q: Do I need two cards for the Sony A7IV?
A: Not required, but recommended for professional work. The dual card slots enable backup recording, redundancy if one card fails, or simultaneous recording to both cards. Many professionals use one CFexpress and one UHS-II SD card for workflow flexibility. Important note: According to Imaging Resource (2024), when using dual-slot simultaneous recording, the camera writes at the speed of the slower card — pairing a fast CFexpress with a slow SD card negates the CFexpress speed advantage.
Q: How much storage do I need for 4K video recording?
A: The Sony A7IV’s 4K bitrate is approximately 200 Mbps, consuming roughly 1.5 GB per minute. For a typical 2-hour shoot, plan for 180 GB of storage. A 128 GB card provides approximately 85 minutes of continuous 4K recording. Note that cards 64 GB and larger use the exFAT file system for seamless continuous recording without the 4 GB file-splitting limitation of FAT32 (SD Association, 2017).
Q: Is there a performance difference between UHS-II SD and CFexpress for Sony A7IV?
A: Yes, significantly. CFexpress Type A cards deliver up to 800 MB/s read and 700 MB/s write versus the 312 MB/s theoretical maximum of UHS-II SD (CompactFlash Association, 2019). For high-speed burst photography or demanding 4K work, CFexpress is superior. For standard photography and casual 4K recording, a V90 UHS-II SD card performs adequately and offers the advantage of working in both camera slots.
Conclusion
A good memory card can make a big difference in your Sony A7IV’s performance and image quality. By choosing a memory card that suits your needs and expectations, you can enhance your shooting experience and creativity.
Depending on your budget, preferences, and needs, you can choose from the two memory cards we recommended above: the Sony TOUGH CFexpress Type A Card (best for demanding video and burst work) or the SanDisk Extreme PRO UHS-II SD Card (best for flexible, budget-conscious shooting). Both of them are compatible with the Sony A7IV and can deliver excellent results.
If you want to learn more about how to choose the best memory cards for your Sony A7IV or other cameras, you can check out these resources:
– Best Memory Cards for Sony a7 IV – Camera Times
– Best Memory Cards for Sony a7R IV – Camera Times
– Top 5 Best Sony a7IV SD Cards in 2023 – SD Memory Cards
Remember, the best memory card for your Sony A7IV is the one that meets your needs and expectations. We hope this article has helped you make an informed decision and improve your photography skills.
Happy shooting!
Further Reading
(1) Best Memory Cards for Sony a7 IV – Sony Camera News
(2) Best Sony A7 IV Memory Cards With Speed & Buffer Tests – AlphaShooters.com