![]() The Extreme 90MB/s 64GB SD card was tested in a variety of USB 3.0 memory card readers. SanDisk Extreme cards are backed by a lifetime warranty. A lot number is located on the back of the card and the case designates this card is made in China. ![]() The card features a gold label that is marked with its 90MB/s read speed. The Extreme 90MB/s 64GB SDXC card is rated UHS Speed Class 3 (U3) which makes it suitable for recording 4K video that requires at least 30MB/s continuous write speed. SanDisk advertises the 16, 32 and 64GB with a 40MB/s write speed, while the 128 and 256GB cards receive a faster 60MB/s write speed. Extreme 90MB/s cards available in 16, 32, 64, 128 and 256 GB capacities. This version was released September 2015 and features a 90MB/s read speed according to SanDisk. The 64GB SanDisk Extreme 90MB/s SDXC UHS-I U3 memory card is an update to the Extreme 60MB/s card. SanDisk Extreme 90MB/s UHS-I U3 64GB SDXC Card Review Introduction
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