Web Hosting & Remote IT Support The SD 9.1 standard will double the speeds of the best microSD cards out there today, with the next generation of SD cards hitting speeds of up to 2GB/s. With SD 9.1, unveiled by the SD Assocation (SDA), the next cohort of SD Express memory cards uses PCIe Gen4 that can deliver 1,969MB/s – more than double the maximum speeds introduced with the first microSD protocol in the SD 7.1 spec. SD Express memory cards come in four varieties, including SD Express Seed Class 150, 300, 450 and 600 – with these numbers corresponding with minimum read and write speeds measured in Mb/s. This means these microSD cards can range anywhere from 0.6GB/s to 2GB/s. By contrast, the best portable SSDs usually land at roughly 1GB/s. The fastest microSD cards ever What that means, in real terms, is the ability to transfer a Blu-ray movie , which is roughly 25GB, in 12.5 seconds. Speeds like this will also be fast enough to handle transferring 8K video files, which