most namely adding support for Ultra High-Speed II SD cards (UHS-II) and Ultra Capacity SD cards (dubbed SDUC) [h/t Phoronix]. UHS-II SD cards support speeds up to 312 MB/s, while SDUC cards have ...

If you want to add more storage to your Nintendo Switch 2, you'll need a new microSD Express card. Here's what you should ...

Within the UHS speed rating, you’ll also see that some SD cards are marked as UHS-I, UHS-II, or UHS-II, which correspond to maximum write speeds of 104MB/s (UHS-I), 312MB/s (UHS-II), and 624MB/s ...

After a new round of testing, the Lexar Professional 1800x v60 UHS-II SDXC is our pick for the best SD card for most people. The SanDisk Extreme V30 UHS-I (128 GB) is best for less demanding tasks.

many UHS-II cards are designed around UHS-II for their performance and are much, much slower when limited to UHS-I. SAMSUNG PRO Plus microSD Memory Card + Adapter, 512GB microSDXC, Up to 180 MB/s ...

It’s also worth noting that SD Express cards are not backwards compatible with UHS-II (or UHS-III), so if you try to plug one into a device with a UHS-II slot, it’ll be limited to UHS-I speeds.

If you have a Sandisk SD card in your Canon EOS R5 II ... that "certain SanDisk Extreme PRO SDXC UHS-II 64GB, 128GB and 256GB ...

Thankfully, both ROG Ally devices are compatible with the newer (faster) UHS-II microSD cards, but these cards aren't as common. To help you out, here are the best microSD cards for ROG Ally on ...

For an example of a versatile SD card in 2025, take a look at the Transcend SDXC UHS-II U3. In testing, it delivered superbly fast read and write speeds. It also offers the kind of durability that ...

It is common for memory card readers for SDXC UHS-II memory cards to have two slots, either two SDXC UHS-II slots or separate slots for microSD and the normal SD memory card size. More expensive ...

Not just that, the entire ROG Ally family sports a UHS-II microSD card slot, allowing for cards that are faster at both reading and writing than UHS-I, the baseline spec found in the Steam Deck ...