The fastest SD memory cards currently available are UHS-II cards. The UHS-II interface is capable of up to 312MB/s bus speed while actual card transfer speeds are slightly lower.
A total of 191 SD cards were tested using benchmark software in several card readers. The fastest SD card by write speed was the Sony SF-G 300MB/s UHS-II 32GB with 273.672 MB/s sequential write speed. The fastest card by read speed was Transcend Ultimate UHS-II U3 32GB with 307.050 MB/s sequential read speed.
Below is a list of the 10 fastest SD cards by write speed:
Below is a list of the 10 fastest SD cards by read speed:
A new standard UHS-III has been announced in 2017, but there are currently no UHS-III SD cards available on the market. The UHS-III interface will be capable of up to 624MB/s bus speed, and actual transfer rate will probably peak around 600MB/s.
Traditional CompactFlash cards operate up to 167 MB/s speed using UltraDMA Mode 7 (UDMA-7). This standard was announced in 2010 and there is no faster option available as it is limited by the parallel ATA interface. A newer variant called CFast uses a serial ATA interface but is not compatible with standard CompactFlash cards.
A total of 26 CF cards were tested in memory card readers. The fastest CF card by write speed was the Lexar Professional 1066x 128GB with 155.644 MB/s sequential write speed. The fastest card by read speed was Lexar Professional 1066x 64GB with 162.620 MB/s sequential read speed.
Below is a list of the 10 fastest CF cards by write speed:
Below is a list of the 10 fastest CF cards by read speed:
The fastest CFlash is Version 2.0 that was announced in 2010 and up to 600 MB/s speed is possible.
The fastest XQD card is XQD 2.0 which was announced in 2012. This standard provides up to 1,000 MB/s (1 GB/s). This is currently the fastest type of flash memory card available on the commercial market.