With the transistor density required, an SD card with a full-fledged and shrunk-down SSD controller and cache would output heat that it wouldn’t be able to dissipate in its plastic casing. In theory, ...

Fritz also has a nifty diagram that shows how the flash SSD and system memory interconnect with lanes connecting the dedicated DRAM, 16GB GDDR6 RAM, and flash storage with the 7nm SoC.

Adata's NVMe-based SD Express 7.0 card doubles UHS-II performance, and runs faster than a SATA SSD. By Gordon Ung Executive Editor, PCWorld Oct 8, 2021 12:07 pm PDT ...

SanDisk recently announced a 32GB SD card (pictured) at PMA08 that will retail for US$349 in April. That's a lot of meggers (as an old client used to say) in a tiny little chip.

SD cards are generally cheaper per unit but become expensive when compared to SSDs of similar capacity. For example, a high-capacity SD card can be as expensive as a faster SSD of the same size.