SanDisk Extreme Pro SDXC UHS-I vs UHS-II: Which 128GB Card?

Quick answer

Choose the SanDisk Extreme Pro 128GB SDXC UHS-II if your camera supports UHS-II and you shoot continuous bursts or high-bitrate video that benefit from its faster shot and transfer speeds. Choose the UHS-I version if your camera is UHS-I only, you mainly shoot 4K UHD, or you want to spend far less on a 128GB card.

What UHS-I and UHS-II actually change

UHS-II adds a second row of pins on the card and a faster bus, which can raise both shot speed (how quickly the card accepts data from the camera) and transfer speed (how quickly files move to your computer). The SanDisk Extreme Pro UHS-II 128GB is rated for shot speeds up to 260MB/s and transfer speeds up to 300MB/s, while the UHS-I version is rated for shot speeds up to 90MB/s and UHS Class 3 (U3) for 4K UHD video.

Those numbers are maximums under ideal conditions. Actual speed depends on your camera's card slot, the card reader you use, and the file sizes you shoot. If your camera only has a UHS-I slot, the UHS-II card will run at UHS-I speeds, so you pay for headroom you cannot use.

Where the UHS-II card earns its price

The UHS-II card's higher shot speed matters most when the camera's buffer fills during continuous burst shooting or when you record high-bitrate video that demands sustained write performance. Its faster transfer speed also shortens offloads when you use a UHS-II-compatible reader, which helps on multi-card shoots.

The trade-off is cost and compatibility. At the catalog prices shown, the UHS-II card costs substantially more than the UHS-I version, and it only delivers its full benefit with a UHS-II camera and reader. If you are unsure whether your camera supports UHS-II, check the camera manual or card slot specification before buying.

Where the UHS-I card is the smarter buy

The UHS-I version is rated U3, which is enough for 4K UHD video and everyday stills. For most photographers using UHS-I cameras, it delivers reliable performance at a much lower price per card. That leaves more budget for a second card, a faster reader, or other gear.

The limitation is burst depth and offload speed. If you routinely shoot long bursts of RAW files or move large video files, the UHS-I card will clear the buffer more slowly and take longer to transfer. That is a workflow cost, not a reliability problem.

Trade-offs to weigh before you buy

• Speed headroom vs. compatibility: The UHS-II card offers much higher shot and transfer speeds, but only a UHS-II camera and reader can use that extra bandwidth. A UHS-I camera will run it at UHS-I speeds. Confirm your camera's card slot generation before paying for UHS-II.
• Price vs. capacity strategy: The UHS-II card costs significantly more. If your camera is UHS-I, buying the UHS-I card leaves budget for a spare card or faster reader. Decide whether one fast card or two slower cards better fits your shooting style.
• Burst and video demands vs. everyday shooting: The UHS-II card pays off for continuous bursts and high-bitrate video. For 4K UHD and everyday stills, the UHS-I U3 card is sufficient. Match the card to your heaviest regular workload, not occasional use.

Product facts

• SanDisk Extreme Pro 128GB SDXC UHS-II – 300MB/s: Shot speeds up to 260MB/s and transfer speeds up to 300MB/s. These higher ratings can shorten buffer clearing during bursts and speed up file offloads when paired with UHS-II hardware.

  

• SanDisk Extreme Pro 128GB SDXC UHS-I: Shot speeds up to 90MB/s with UHS Speed Class 3 (U3). U3 is suitable for 4K UHD video, making this card a practical lower-cost choice for UHS-I cameras.

  

Which card fits your camera

Best for

• Photographers with UHS-II cameras who shoot continuous bursts or high-bitrate video
• Users who offload large files often and have a UHS-II card reader

Not for

• Cameras with UHS-I only slots, where the UHS-II card cannot reach its rated speeds
• Budget-focused buyers who mainly shoot 4K UHD and stills