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>what is the selling point of an ARM server? .....Are they significantly cheaper per GHzcore?
In the context of AWS.

They are cheaper per some / specific workload* on AWS.

Especially when ARM Graviton 2's vCPU on AWS are actual CPU core while Intel / AMD instances are CPU thread.

And in general AWS offers the G2 instances with the same vCPU core at 20% discount compared to AMD / Intel instances.

> Especially when ARM Graviton 2's vCPU on AWS are actual CPU core while Intel / AMD instances are CPU thread.

Thank you for that information. Is there a reference that documents this somewhere?

It is clearly listed on AWS Instance Types [1]

Each vCPU is a thread of either an Intel Xeon core or an AMD EPYC core, except for M6g instances, A1 instances, T2 instances, and m3.medium.

Each vCPU on M6g instances is a core of the AWS Graviton2 processor.

Each vCPU on A1 instances is a core of an AWS Graviton Processor.

I looked around but didn't find it. Thanks a lot.