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Re:New Compute Engine A2 VMs–First Nvidia Ampere A100 GPUs i... by cperciva on Tuesday July 07, 2020 @12:48PM (#23761059)
It's even worse than that. On AWS, A1 is ARM. The successor to A1 is M6G.

Meanwhile M5A, as you note, is AMD.

Re:New Compute Engine A2 VMs–First Nvidia Ampere A100 GPUs i... by codemk8 on Tuesday July 07, 2020 @01:01PM (#23761258)
For azure, NC is for vms with NVidia card. Seems that they deliberately choose different terms.