![]() There’s no difference between SanDisk ultra vs Extreme regarding the UHS bus interface because they are both UHS -I, but the UHS speed class may be different. The UHS-I has a theoretical transfer speed maximum of 104MB/s, and the UHS-II has a theoretical maximum of 312MB/s. The UHS bus interface is indicated with a Roman numeral – either I or II. U-1 has a minimum write speed of 10MB/s, and U-3 has a minimum write speed of 30MB/s. The UHS speed class is marked with a ‘U’ followed by the class, which can be 1 or 3. In combination, they determine what the minimum write speed and the theoretical maximum transfer speed are. The UHS class is related to bus speed and the bus interface. ![]() This makes the Sandisk Ultra write speed objectively better. The read speed of the SanDisk Extreme is up to 160MB/s. So, the SanDisk Extreme will have shorter buffering times. This refers to how fast a photo or video is saved to your memory card. A SanDisk Ultra card has a max write speed of 80MB/s, while the SanDisk Extreme cards reach up to 90MB/s. One key difference between Sandisk Ultra and Extreme is the write speeds. Here are the most important specs of each memory card so you can choose which is best for you. Sandisk Ultra vs Extreme: How Do They Compare?
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