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What SD card do you need for maximum speed on the Raspberry 5?

Is there a reason why the Raspberry didn't support A2?

Yeh I’d like to know too. I have a Pi5 on pre-order.

I’d also like to know how much faster the NVMe SSD drive is to the fastest microSD

A lot. Fastest microSD through UHS-I interface tops out around 100 MB/sec. NVMe SSD tops out at 450 MB/sec at Gen 2 speed, and 900 MB/sec at (technically unsupported, but working) Gen 3 speed.

So is the UHS-I support hardware bound?

Or could we get those speeds on Raspberry 4?

Hardware; Pi 4 only used SDR54 or something like that, half the data rate as Pi 5 microSD interface.

Do you know if Pi5 has SD/A2 support?

I would also think that random read/write performance (throughput/IOPS and maybe latency too? just a hunch...) on SSDs will be miles ahead of microSD and likely represents impacts on real-world/OS scenarios much more than sequential numbers

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