Although SanDisk publishes a silly $199.99 list price, the Extreme 64GB card costs about $55 at various retailers right now. It's two notches below SanDisk's top level—above it, there's the Extreme Plus and the Extreme Pro—but I don't think the extra speeds balance out the extra cost yet. We tested several recent microSD cards using the A1 SD Benchmark program on a, the XBench disk benchmark program on an Apple MacBook Pro, and by transferring a 2.4GB file to and from the card when it was plugged directly into the MacBook Pro's SD card slot.

• Micro Sd Card 256 Gb

Jul 3, 2017 - But not all SD cards are created equal—you'll find different speed classes. Were designed and produced before the speed class rating system was introduced. You can't plug a microSD card into a standard SD card slot.

Micro Sd Card 256 Gb

The SanDisk Extreme outperformed both the similarly-priced and the more expensive, as well as slower and Kingston Class 4 cards we were using to compare. The big differences came when I was copying files from the laptop to the card, a common thing you'd do if you want to play movies on your phone. As you can see in the chart below, the SanDisk Extreme and Lexar 633x cards were much faster than any of the competitors. The Galaxy Note 3's SD card speeds seem to max out at around 20MBps both reading and writing. Only the Extreme card hit both limits. In most mobile use cases, sequential read and write speeds are a lot more important than random read and write speeds. Copying and playing photos, videos, and music all use sequential reads and writes, and that's what most people do with their microSD cards.