SanDisk Extreme PRO 310MB/s SDXC UHS-II V90 Memory Card

Overview
SanDisk Extreme PRO SD UHS-II V90 is an SDXC memory card for 8K video recording and high-resolution stills. It uses the UHS-II interface and carries Video Speed Class 90 (V90) and UHS Speed Class 3 (U3) ratings. This listing covers the 128GB and 256GB capacities.

Speed
On the 128GB and 256GB cards SanDisk rates read speed at up to 310 MB/s and write speed at up to 304 MB/s, with a minimum sustained write speed of 90 MB/s. SanDisk states these figures come from internal testing, that performance varies with the host device and usage conditions, and that a device capable of reaching those speeds is required.

Video and speed classes
The card carries Video Speed Class 90 (V90) and UHS Speed Class 3 (U3). SanDisk describes V90 as a sustained video capture rate of 90 MB/s with UHS-enabled host devices. SanDisk states that 4K UHD (3840 x 2160) and 8K (7680 x 4320) video support may vary with the host device and file attributes.

Durability
SanDisk states the card is water- and dust-resistant and was tested under controlled laboratory conditions to a rating of IP68 under IEC standard 60529, and that the card must be clean and dry before use.

Physical
The card measures 2.29mm x 23.88mm x 32mm and weighs 1.67 g.

Compatibility
SanDisk lists the card for DSLR and mirrorless cameras. In a UHS-I slot the card still works, at UHS-I speeds. To read it at UHS-II speed on a computer a UHS-II capable reader is needed, such as the SanDisk ImageMate PRO USB-C multi-card reader or the Lexar Professional CFexpress Type A / SD USB 3.2 Gen 2 reader.

Capacities and model numbers
This listing covers two capacities, sold under SanDisk model numbers SDSDXDE-128G-GN4IN (128GB) and SDSDXDE-256G-GN4IN (256GB). SanDisk notes that 1GB equals 1,000,000,000 bytes and that actual user storage is less.