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UHS-II SD cards are worth it when your camera supports UHS-II and faster burst handling or computer transfers improve your workflow. If your camera supports only UHS-I, a UHS-II card will not make it use the faster interface. For video, choose a card that meets the speed class required for your camera’s recording mode; UHS-II and V60 or V90 describe different things.
What UHS-II changes—and what it does not
UHS-II is a bus interface: the connection standard through which an SD card and a compatible device communicate. The SD Association specifies maximum bus-interface speeds of 104 MB/s for UHS-I, and 156 MB/s full duplex or 312 MB/s half duplex for UHS-II. UHS-II uses a second row of pins and two data lanes. These are interface ceilings, not guaranteed card speeds or typical camera results; actual maximum card speed varies, and a device’s average write speed can vary with the device and operation. SD Association bus-speed overview.
A UHS-II card can be used in a UHS-I host, but it will not provide UHS-II interface speed there. The SD Association recommends matching the card to the fastest interface supported by the host. SD Association speed-class overview.
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UHS-II versus UHS-I: the practical differences
| Decision factor | UHS-I | UHS-II |
|---|---|---|
| Maximum bus-interface rate | 104 MB/s, per the SD Association standard | 156 MB/s full duplex or 312 MB/s half duplex, per the SD Association standard |
| Camera requirement | Works when the camera supports UHS-I; check the manual for its card requirements. | The camera must support UHS-II to use the UHS-II interface. |
| Potential benefit | May be sufficient if camera performance and transfers meet your needs. | Can help where compatible camera throughput or computer-side offload speed matters. |
| What the bus label guarantees | It does not guarantee a card’s actual speed or a camera’s average write speed. | It does not guarantee a card’s actual speed or a camera’s average write speed. |
The figures are standards limits, not independent card benchmarks. Actual performance depends on the card and host, so do not assume that moving from UHS-I to UHS-II will produce a particular improvement in burst depth, buffer clearing, or transfer time.
#1 Best Overall
- Speeds up to 280MB/s read, up to 120MB/s write
- Shoot stunning videos in 1080p Full-HD, and 4K
- Save time with a dramatically accelerated workflow
- Backwards-compatible at the highest UHS-I speeds
- Rigorously tested to ensure performance, quality, compatibility, and reliability
When a UHS-II card is worth considering
Your camera supports UHS-II and bursts matter
For still photography, UHS-II can be useful if your compatible camera writes quickly enough for the faster interface to matter—for example, during sustained bursts or when clearing the buffer between sequences. Whether it changes your experience depends on the camera and card, so check the camera manual and product specifications rather than relying on the interface label alone.
You regularly move large files to a computer
A UHS-II card may speed up computer-side transfers when the card reader and its connection also support UHS-II. If your computer lacks a suitable SD slot, the SD Association recommends using a reader or adapter. A reader helps with file transfers; it does not improve in-camera capture. SD Association FAQ and speed-class information.
Rank #2
- Speeds up to 280MB/s read, up to 120MB/s write
- Shoot stunning videos in 1080p Full-HD, and 4K
- Save time with a dramatically accelerated workflow
- Backwards-compatible at the highest UHS-I speeds
- Rigorously tested to ensure performance, quality, compatibility, and reliability
Your existing setup already meets your needs
If your camera supports only UHS-I, or your current workflow does not benefit from faster capture or offload, paying extra for UHS-II may bring little practical value. Compare the total setup you need, including a compatible reader if faster computer transfers are part of the reason for upgrading.
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UHS-II is not the same as V60 or V90
The UHS label identifies the bus interface. Video Speed Class identifies minimum sequential performance under defined conditions, which is useful when a camera must sustain writes during recording. In the SD Association’s definitions, V60 represents a 60 MB/s minimum and V90 a 90 MB/s minimum. Those are minimum-performance classes, not maximum transfer speeds. The association lists V60 and V90 among classes applicable to UHS-II and UHS-III product families. SD Association Speed Class definitions.
Rank #3
- Speeds up to 280MB/s read, up to 160MB/s write
- Shoot stunning videos in 1080p Full-HD, and 4K
- Save time with a dramatically accelerated workflow
- Backwards-compatible at the highest UHS-I speeds
- Rigorously tested to ensure performance, quality, compatibility, and reliability
So a UHS-II card is not automatically the right video card simply because it has the faster bus. Match the card’s speed class to the requirements for the exact recording mode you intend to use.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choosing a card for video
The SD Association gives broad examples: U3 or V30 for Full HD to 4K recording, V60 for 4K UHD to 8K, and V90 for 8K UHD. These examples are not substitutes for your camera’s requirements. The camera model and recording format determine the suitable card; consult the manual for the intended mode and supported capacity. SD Association Speed Class overview and SD Association FAQ.
Quick Recap
Best Value
- CAPTURE LARGER THAN LIFE. Unlock 4K UHD(3) brilliance and pristine high res stills with video speed class ratings of U3 and V30(4).
- SPEED BARRIERS SHATTERED. Save precious moments with blazing read speeds up to 250MB/s(2) and write speeds up to 170MB/s(2) [256GB-1TB capacities(1)].
- MAXIMIZE WITH MASSIVE CAPACITY. Capture for longer and store more with up to 2TB(1) of storage that can hold up to 2,808 minutes of 4K UHD video recorded at 30 fps (641MB/minute)(9).
- DEFY THE ELEMENTS. Unrelentingly resilient, Sandisk SD memory cards are engineered to perform in extreme conditions, despite rough handling and constant use.(6)
- CONTENT MANAGEMENT, SIMPLIFIED. Back up, organize, and transfer everything easily with the Sandisk Memory Zone desktop app,(7) whether you use an SD card slot or a card reader.
Rank #4
- Extreme performance for professional photographers and videographers with read speeds up to 280MB/s & write speeds up to 180MB/s for seamless content capture
- Class 10, U3 Rated with V60 Video Speed to enhance performance and capture ultra high resolution imagery and extended lengths of 4K Ultra HD and Full HD video
- V60 Video Speed Class to capture stunning 4K content, professional quality burst mode HD photography, and 4K Ultra HD Video at 4096x3072
- Built with the power of UHS-II technology to rapidly increase transfer speed and accelerate your workflows during post production editing
- Compatible with UHS-II enabled DSLR cameras, mirrorless cameras, professional video cameras, and backwards compatible with UHS-I devices at UHS-I speeds
- Find the camera manual’s memory-card or recording-media section.
- Look up the speed class and capacity required for your specific recording mode—not just the camera’s general video capability.
- Choose a card that meets that requirement, then check whether your camera supports UHS-II if you also want the faster bus interface.
A quick buying decision
- Choose UHS-II for capture if your camera supports it and faster writes could help with your burst workflow.
- Consider UHS-II for offload if you often transfer large files and will use a UHS-II-compatible reader and connection.
- Choose by speed class for video based on the camera manual’s requirements for the recording mode you plan to use.
- Stay with UHS-I if your camera lacks UHS-II support or your present capture and transfer speeds are adequate.
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