There's also the bus type. These are more relevant for ultra-fastSD cards. The theoretical maximum of the two cards is 104 MB/s. These aren't necessarily their actual speeds, but what the connection is capable of. If you want to record 6K or 8K video, you need a card that can handle it. The Roman numeral I or II is the one used to indicate these.
The video speed class is finally here. The minimum write speed is represented by a number in MB/s. There are five speed classes: V6, V10, V30, V60, and V90 A V6 is a card that has a minimum write speed. This is a good symbol to look out for if you want to hit a minimum speed.
All of the symbols are just baselines. If not on the card itself, you can find speeds on a card's listing page. Sometimes the card's actual speed can be quite large, so be sure to check.
It's important to keep in mind that there are different speeds for reading and writing. If you need to take a lot of photos in a short period of time, your card needs to write fast as well. The best way to make sure you get what you want is to look up the card's speed directly.
Is it a good idea to get the fastest card.
Your natural inclination is to buy the fastest card you can. There is a tradeoff. You should consider your use case when shopping for a faster card. If you need to transfer a lot of data at once, a faster card may be able to do the job. If storage capacity is more important, a slower card may be more cost effective.
Here is a 128-gigabyte card that can record up to 8K footage and can read data at speeds up to 280 MB/s. Normally, it costs $150. There is a 128 gigabyte card that can only read up to 170 MB/s. It is better to balance out what is best for you when it comes to higher speeds.
What your device can do is something you have to think about. The Nintendo Switch only has transfer speeds up to 95 MB/s, so slower cards will not work. You will get more use out of extra storage at that speed. Speed is important, but it isn't the only thing.
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