Best microSD Cards for Galaxy S8 in 2018

With read speeds of up to 100MB/s and write speeds of up to 90MB/s, this is the fastest card from Samsung that's also U3 classified which makes it perfect for 4K video. If the 256GB card is too much or too expensive there are smaller and cheaper options available, too.

SanDisk's high-performance microSDHC UHS-I Card offers transfer speeds of up to 80MB/s and with its U3 rating, it is more than capable of handling 4K video. We'll highlight the 128GB card for just $46, but smaller storage sizes are available!

PNY's U3 Pro Elite 128GB card offers plenty of storage and the speeds you need. Classified at U3, it is great for video, and it is capable of up to 95MB/s read and 90MB/s write. Given the pricing of the other PNY cards, this is your best value for sure.

Samsung's EVO 128GB microSD card isn't the company's top offering, but it comes with decent speeds and a price tag to match. With up to 48MB/s read and write speeds and Class 10 or U1 classification, it can handle 1080p video without a problem. If you want a Samsung-branded card that doesn't break the bank, this is the one to go with.

SanDisk is a respected brand when it comes to memory cards and storage products, and cards like this show you why. The SanDisk Ultra 128GB is a Class 10 card that comes with a 10-year warranty and has quick transfer speeds (up to 80MB/s). If you want a bit more memory, you can get a 200GB card for just $63.