An additional clue is the UHS Speed Class rating, which is U1 or U3. Choosing the best one for your camera depends on your camera's resolution, buffer size and burst shooting speeds. Speed class is categorized into Class 2 (a minimum write speed of 2MB/s), Class 4 (4MB/s), Class 6 (6MB/s), and 10 (10MB/s). The numbers indicate the minimum writing speed when put under data transfer. There are three main classes: Speed Class (denoted with a number in a circle), UHS Speed Class (a number in an open beaker-like icon), and a Video Speed Class (V followed by a number). Faster write speeds are particularly important for shooting sports or action in burst mode.Ĭard classifications like V30 or U3 are just categorizations of these speeds. The more useful number for telling you how quickly your camera can record images to your SD card is the 'write' speed (also measured in MB/s).
While the main figure on the front of card is likely to be its theoretical 'read' speed (measured in MB/s, or MegaBytes per second), this only tells you how fast you can copy photos to your computer in ideal settings. The main figures to focus on are the 'write' speeds and (to a lesser extent) 'read' speeds. Its write speed is a little slow compared to other UHS-I cards in this class range, but it’s good value for money and the V30/U3 class listing means it’s still suitable for up to 4K UHD video recording.Īctual transfer speeds under testing churned out a write speed of 33MB/s and read speed of 82MB/s not too bad, but the write speed is close to the minimum V30 classification on the label, so that's worth bearing that in mind if write speeds are important to your work.Ĭhoosing a new SD card can be confusing with so many classes and speeds available. While the higher capacity cards increase in price exponentially, the 633x appears in sizes as small as 16GB, making it suitable for a wide range of photographers and videographers alike who require all kinds of capacities for casual or professional use. However, Lexar is renowned for its memory card line-up and the 633X UHS-I performs well under scrutiny.
Since Lexar’s announcement of the world’s first consumer 1TB SD card back in 2019, there have been several manufacturers that have jumped into the game.
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