The other metric that sometimes pops up on MicroSD cards is the Application Performance Class. Rather than referring to the minimum speed for writing predictable data in large chunks to the card, this number references the capability to random smaller read and write operations, like you might have when running an application stored on the card. There are currently only two options here, A1 and A2, with the A2 being the faster, newer standard. While there are some exceptions, most of the V30 or higher MicroSD cards I see for sale online are A2, but it's worth keeping an eye out for if you plan on using the card in your phone.
In Arm tradition, X925 has a number of configuration options. However, X925 omits the shoestring budget options present for A725. X925’s caches are all either parity or ECC protected, dropping A725’s option to do without error detection or correction. L1 caches on X925 are fixed at 64 KB, removing the 32 KB options on A725. X925’s most significant configuration options happen at L2, where implementers can pick between 2 MB or 3 MB of capacity. They can also choose either a 128-bit or 256-bit ECC granule to make area and reliability tradeoffs.
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