SD 9.1 specs double microSD Express card speeds to 2 GB/s, introduce new speed classes for SD Express

Faster and more energy efficient (Image Source: PC World)

PCIe 4.0 is finally coming to microSD Express cards, doubling the maximum speed to 1,969 MB/s. The latest SD 9.1 specs are also defining four SD Express classes with minimum read/write speeds between 150 and 600 MB/s, as well as offering improved power and heat management for all types of cards.

With the latest SD 9.1 specifications, miniSD Express cards may reach speeds of up to 2 GB/s and the SD Express standard is receiving support for multi-stream access up to eight streams plus power and thermal improvements via four new speed classes.

microSD Express cards can now take advantage of the PCIe 4.0 X1 specs, doubling the initial 985 MB/s speeds up to 1,969 MB/s. On the other hand, the SD Express standard that is featured only on SDXC, SDUC, microSDXC and microSDUC memory cards remains capped at 4 GB/s, but it is now grouped into four distinct classes that ensure a minimum read/write speed in MB/s. Thus the new classes are E150, E300, E450 and E600.

As explained by SDA president Hiroyuki Sakamoto, “by defining minimum assured sequential performance standards for SD Express memory cards, the SDA helps both device manufacturers and consumers ensure the best recording and playback of all types of content.”

The new power and thermal management features allow for increased efficiency. Since not every workload requires the maximum performance (MP) setting, a card can now suggest necessary and sufficient MP values according to the targeted SD Express speed class and the selected PCIe bus mode. Thus, the host device can select an appropriate MP value depending on the card’s capabilities so that the card does not consume excessive power and does not overheat.

Some of the applications that benefit most from the increased microSD Express and SD Express speeds include data-intensive wireless or wired communication, super-slow motion video, RAW continuous burst mode and 8K video capture and playback, 360-degree cameras/videos, multi-channel IoT devices and automotive entertainment systems.

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(Image Source SDA)

Bogdan Solca – Senior Tech Writer – 2149 articles published on Notebookcheck since 2017

I first stepped into the wondrous IT&C world when I was around seven years old. I was instantly fascinated by computerized graphics, whether they were from games or 3D applications like 3D Max. I’m also an avid reader of science fiction, an astrophysics aficionado, and a crypto geek. I started writing PC-related articles for Softpedia and a few blogs back in 2006. I joined the Notebookcheck team in the summer of 2017 and am currently a senior tech writer mostly covering processor, GPU, and laptop news.

Bogdan Solca, 2023-10-20 (Update: 2023-10-20)

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