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Speed ratings help you avoid slow cards.
Last updated: November 1, 2026.
What the labels mean
Read U and V ratings for video and A ratings for apps.
Which to buy
See SD cards and 4K microSD cards.
Pro needs
See V60 and V90 cards.
Frequently Asked Questions
Is higher always better?
Only if the device can use it.
What is A2?
App performance rating.
What about UHS-II?
Needs UHS-II hardware.
Bottom Line
Choose by what your device can use.
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