SanDisk Extreme PRO 300MB/s SDXC UHS-II V90 Memory Card

Overview
SanDisk Extreme PRO SDHC and SDXC UHS-II is an SD memory card for cameras recording 8K, 4K and Full HD video. It uses the UHS-II interface and carries Video Speed Class 90 (V90) and UHS Speed Class 3 (U3) ratings. This listing is the 128GB SDXC capacity.

Speed
SanDisk rates read and transfer speed at up to 300 MB/s and write and shot speed at up to 260 MB/s. SanDisk states these figures come from internal testing, that performance varies with the host device, and that full performance requires a SanDisk UHS-II reader.

Video and speed classes
The card carries Video Speed Class 90 (V90) and UHS Speed Class 3 (U3). SanDisk describes both as performance ratings designed to support real-time video recording with UHS-enabled host devices. SanDisk states that Full HD (1920 x 1080), 4K (4096 x 2160), 8K (7680 x 4320) and 3D video support may vary with the host device and file attributes.

Physical and environmental
The card measures 2.17mm x 23.91mm x 31.92mm. SanDisk lists an operating temperature of -25 to 85 degrees C and a non-operating temperature of -40 to 85 degrees C. Listed certifications are CE, FCC, C-Tick/RCM, UKCA, EAC and ICES.

Compatibility
SanDisk states the card is backwards-compatible with SDHC and SDXC host devices, and that a UHS-II supported host or a SanDisk UHS-II reader is required to reach UHS-II performance. In a UHS-I slot the card still works, at UHS-I speeds. Readers that support UHS-II for SD include the SanDisk ImageMate PRO USB-C multi-card reader and the Lexar Professional CFexpress Type A / SD USB 3.2 Gen 2 reader.

Capacity and model number
This listing is the 128GB card, sold under SanDisk model number SDSDXDK-128G-GN4IN. SanDisk notes that 1GB equals 1,000,000,000 bytes and that actual user storage is less.