As we use larger and larger files and more powerful devices, it is also important to keep the transfer specifications up to date. The SD association, which defines the standards for removable memory, has just announced the new milestone for SD cards: up to 4 GB / s transfer speed in the new SD 8.0 standard
The new standard retains the name SD Express with which SD 7.0 was baptized in 2018. The main difference is that it is we go from 985 MB / s which were then obtained to 3 938 MB / s available with SD 8.0, four times the transfer speed. But of course, always taking into account the optimal conditions.
What speeds does SD 8.0 support?
3938 MB / s (almost 4 GB / s) is a speed that standard SD 8.0 cards can achieve thanks to compatibility with PCIe 4.0 but This will also require a card reader that supports two PCIe 4 lanes.. Otherwise, the transfer speeds will be halved (approximately 2 Gb / s). It’s still outrageous when you consider that it’s twice the fastest SD cards on the market today.
The SD Association explains that to achieve this speed, the SD card will use two of its pin spaces, transferring 1,969MB / s into each. In the case of a single channel, the speed is reduced. In the following table we can see what speeds are obtained depending on the host and the type of SD card:
The SD association notes that this new design of SD Express card with SD 8.0 standard will be available for different cards of different sizes such as SDHC, SDUC or SDXC among others. And as we’ve seen, it’ll also be compatible with older card readers in exchange for slower transfer speeds.
When will SD 8.0 hit the market? Surely in a few months or even from 2021. Once the standard is approved, it is time manufacturers begin to create SD cards compatible with this new standard and design. Samsung, Sony, Transcend or SanDisk are among these manufacturers. So far, no one has announced a specific date to launch these cards.
What does this bring to the end user? Mainly better speeds in devices that require external storage like a camera (where you have to know how to choose the most suitable). It is not only the speed of file transfer but also the internal processes when, for example, the camera needs to record a recently taken image or when a game console like the Nintendo Switch needs to load a game. In short, big improvements as long as the camera supports them (and the cards arrive on the market).
More information | BusinessWire