The Switch 2's increased capabilities allow for more sophisticated gaming experiences, but this may highlight storage limitations, especially when ports have high bandwidth expectations such as those for the PS5. SD Express technology aims to address this by providing microSD cards access to a PCI Express/NVMe interface, theoretically enhancing their bandwidth. Although performance won't reach internal SSD levels due to physical constraints and interleaving processes, SD Express offers significant improvement over traditional UHS-I cards, thus helping microSDs keep pace with modern gaming demands.
The Switch 2's additional power opens the door to more complex games that could lag even more noticeably, especially if they're ported from consoles that expect more than 50 times the storage bandwidth.
These cards are connected to the same PCI Express/NVMe interface that internal SSDs use in modern PCs and the other game consoles, theoretically giving your SD card access to the same bandwidth as internal storage.
Depending on these factors, microSD Express can deliver anywhere between 985MB/s and 3940MB/s of theoretical bandwidth.
Express cards won't make an SD card feel as fast as internal storage, but it will help the microSD card keep pace a bit.
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