The SD Association has unveiled a new SD 8.0 specification for SD Express cards that promises data transfer speeds of up to 4 gigabytes per second.
This table from the SD Association shows the categories and speeds of the future SD Express cards.
The new cards will use the PCI Express (PCIe) version 4.0 specification and will continue the use of NVM Express (NVMe) upper layer protocol, giving them advanced memory access mechanisms. The new SD Express cards will maintain backward compatibility with existing standards to make implementing SD Express into future products easy. Interestingly, the 4GB/second speed is four times higher than the fastest CFexpress cards currently available, although future CFexpress cards could be able to match it when they adopt a similar PCIe 4.0 interface.
SD8.0 comes about one and a half years after the SDA released the SD 7.0 specification (SD7.0). The new cards will provide the transfer speeds necessary for smooth 4K and 8K video capture and recording and playback of 360-degree videos. SD Express will also support ever-evolving gaming systems, allowing people to continue playing video games at faster speeds than before. The microSD Express format will bring these advantages to mobile devices, IoT devices, drones and more.
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