SanDisk SDSDXXY-64G-GN4IN 64GB Extreme Pro SD Card

The SanDisk Extreme Pro SDSDXXY-64G-GN4IN is a 64GB SDXC card rated for up to 170MB/s sequential reads and 90MB/s sequential writes, built on the UHS-I interface with U3 and V30 speed classifications. Those ratings matter in practice: the 170MB/s read speed means transferring a full 64GB card takes under seven minutes with a USB 3.0 reader, while the V30 designation guarantees the 30MB/s minimum sustained write speed that 4K UHD video recording demands. The U3 classification further confirms that this card meets the performance threshold for high-bitrate capture. This bundle includes an Everything But Stromboli USB 3.0 card reader, which is necessary to realize the card's full read speed — using a camera's built-in USB connection or a USB 2.0 reader will bottleneck transfers significantly.

This card is built for DSLR and mirrorless photographers who shoot a mix of high-resolution stills and 4K video. On the Nikon D850, the 90MB/s write speed clears the buffer reasonably well during burst shooting, though the 45.7MP RAW files will fill the buffer faster than lower-resolution bodies like the D3400. The 64GB capacity provides a practical working amount for most single-session shoots but will require swaps or supplementation during extended video work. As a UHS-I card, it does not leverage UHS-II bus speeds, which means photographers investing in UHS-II-capable bodies may want to consider a UHS-II card to maximize their hardware's throughput. For shooters with UHS-I cameras or those who prioritize proven reliability and a strong price-to-performance ratio, this Extreme Pro remains one of the most dependable options in its class.