A lot will depend on what bang/buck and bang/watt a64 offers compared to competitors.Also, the bang/watt·hour: while the power (watts) requirements may be the same, a processor may consume less while idle and thus eat up less energy (watts·hour) overall. Given their history, it would not be surprising if this was the sweet spot for ARM64: you don't need to run all processors at close to 100% all the time to save energy.
I am thinking about a service like Amazon EC2 which needs to have a reservoir of idle machines to handle traffic spikes (to be really elastic) and will have to eat up their energy costs while idle. Energy costs are nowadays the highest cost of running a server. Given that reserved instances may be half the price of on-demand instances, and that spot instances may be something like 5 times cheaper, I suppose that Amazon would be grateful to reduce costs. I can't wait to rent an AMD64 instance actually!
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