As an upgrade to the standard SD card, SDHC (Secure Digital Extended Capacity) cards offer memory capacities between 4GB and 32GB. This makes them great for everyday use and entry-level users who don't have large storage capacity needs. CompactFlash used to be the preferred format for higher-end DSLRs. However, with the improved performance of SDHC and SDXC cards (and the introduction of newer memory card formats as well), this memory card format is growing more rare. Our SanDisk Extreme SD UHS-I V3 tests saw write speeds live up to its claims, matching them almost exactly at 71.6MB/s. But as with most other cards on this list, the read speeds leave a bit to be desired, coming in at almost half the claimed speed, 71.6MB/s. All can be forgiven, though, bearing in mind the extremely low cost of these cards, especially while still offering such high capacity to users at up to 256GB sizes.

All three SD cards use the UHS-I bus type, which indicates the type of interface between the card and the device. This also has implications on the maximum read and write speeds that can be supported through the interface. The read and write speeds of all three cards are well below the maximum value. Most devices still use the UHS-I bus type primarily because UHS-II SD cards are still prohibitively expensive. Robustness But what's the use of a 1TB memory card if everything reads and writes slowly? Speed should be your next criterion for choosing a memory card. For photographers, write speeds are very important as they determine how fast you can shoot, especially in burst mode. Card classifications like V30 or U3 are just categorizations of these speeds. 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). The numbers indicate the minimum writing speed when put under data transfer. 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). Choosing the best one for your camera depends on your camera's resolution, buffer size and burst shooting speeds. An additional clue is the UHS Speed Class rating, which is U1 or U3. U1 means it can write a minimum of 10MB/s (like Class 10), while U3 pushes the write speed up to a minimum of 30MB/s. More interested in shooting video? The Video Speed Classes are V6, V10, V30, V60, and V90, with V6 suitable for standard definition video recording and V90 capable of 8K video capture. 4K UHD video recording will require a minimum of V10 ideally, and HD video can utilize V6 or below at a push. How we test SD cardsHowever, even the higher capacity offerings – such as this CompactFlash 800x series – are hardly expensive for what’s on offer. Capacities run from a standard 32GB up to 256GB. Specification is also impressive for a budget card, with read speeds of up to 120MB/s and write speeds of 60 MB/s, although actual performance, of course, is affected by camera hardware and software. Durable and reliable, there’s even a built-in error-correcting code to detect and correct any transfer errors. CFexpress Type B Actual transfer speeds under our 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. 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. We found its write speed to be 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. Attention all photography enthusiasts and Canon lovers, get ready to witness the perfect partnership of cutting-edge technology with the SanDisk Extreme PRO 128GB SDXC Memory Card and your Canon 5D Mark IV! 📸💥

As you can see, the jump from one model to the next best one is minimal at around 7 to 8 dollars. This is a fairly small difference unless you’re looking to buy five to ten SD cards at the same time. Lo que realmente destaca de esta tarjeta es su velocidad. Con velocidades de disparo de hasta 90 MB/s, nunca he tenido que preocuparme por perder un momento fugaz. Además, su capacidad de grabación UHS Speed Class 3 (U3) la convierte en la elección perfecta para la grabación de vídeos 4K UHD de alta resolución. La fluidez y la nitidez que proporciona a mis grabaciones son realmente notables, sin ningún tipo de tartamudeo que pueda afectar la calidad.The extra capacity that an Extreme Pro card also gives it an extra boost if you store media in large formats. Again, 4K videos are good examples. This can also be useful if you save in RAW format, which stores a greater amount of information that can be useful in post-processing and color grading. Die Kapazität von 64 GB ist ausreichend für viele Aufnahmen, aber bei längeren Filmaufnahmen oder umfangreichen Fotoshootings kann es notwendig sein, zusätzliche Speicherkarten mitzuführen. Die Langlebigkeit der Karte ist ein weiterer Pluspunkt; sie hat Stürze und extremen Temperaturen standgehalten, ohne Datenverluste zu verursachen. Imagine this: your Canon 5D Mark IV, already a master of capturing stunning visuals, teaming up with a memory card that's like a turbo boost for your camera's performance. With up to 170MB/s read speed, this memory card is to your camera what jet fuel is to an airplane – pure power and exhilaration. ✈️📸 Enter the SanDisk 128GB Extreme PRO SDXC UHS-I Card. While my Lumix loves those UHS-IIs for video, when it comes to snapping those killer stills, I've been leaning into the embrace of this SanDisk card. Why, you ask? A few tasty reasons.