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). Real-world results are often slower (sometimes a lot slower) so check our guide above for a better idea. It’s always worth checking online or in the manual to see whether your smartphone or camera supports the higher capacities – some won’t go beyond 128GB or 256GB, while others need a firmware update – but in the majority of cases, your chosen card should work.

SanDisk Ultra 64GB SDXC Memory Card, Up to 120 MB/s, Class 10

The latest UHS-III standard is faster still, with speeds of up to 624MB/sec in both directions simultaneously, while the SD Express standard takes this up to a staggering 985MB/sec.Currently Linux, Windows 7, Mac OSX (Snow Leopard) and some earlier versions of Microsoft Windows are compatible. You need a V30 card to shoot 4K video at speeds of 60 to 120 frames per second, while V60 is the base level for shooting 8K video at 60fps. So whether you want an affordable backup or a high-performance SD card with the fastest transfer speeds, you’ll find it in our expert guide. If you’re looking for a card that can run apps or cover video on your mid-range or high-end smartphone, you won’t get much better than this. Next we run a storage media testing software on each card which works by filling up the entirety of the card with data and reading it back off the card.

MicroSD memory cards | Argos 64 MicroSD memory cards | Argos

For stills, this would benefit sports and wildlife photographers, or indeed any discipline that requires rapid bursts of high-resolution photographs.Add that to the card's waterproofing, shock proofing, plus the fact that it’s X-ray proof, temperature resistant and static proof, and we have a card that is designed for use in almost any conditions. This defines the level of performance required for storing and running applications on a tablet, smartphone or handheld gaming system, where there’s often a huge discrepancy in performance with apps running from the device’s onboard storage and apps running from a microSD card. Higher-resolution cameras, bigger games and high-quality video downloads put more pressure than ever on your device’s internal storage, and nobody likes deleting valuable content just to make space for more. 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. For this reason, it’s worth looking for Endurance or Industrial microSD cards if you’re planning to use them in your security camera or dashcam.

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It’s far from cheap and we suspect most smartphones won’t use its full performance, but it’s a sign of where things are going. Because actual performance goes beyond labels, we’ve put the best SD cards through a range of real-world tests, to determine which is the top performer in different scenarios.

uk/browse/technology/mobile-phones-and-accessories/microsd-memory-cards/c:30154/capacity-(gb):64/" on this server. However, Lexar is renowned for its memory card line-up and the 633X UHS-I performs well under scrutiny.