c6id.16xlarge

Analysis

The c6id.16xlarge is a compute optimized instance in the c6id series with 64 vCPUs and 128 GiB of memory on Intel Xeon 8375C (Ice Lake) (up to 3.5 GHz), which makes it compute-heavy at 2 GiB of memory per vCPU.

Within the same generation and size, the c6g.16xlarge on AWS Graviton2 costs $2.18/hour, 33% less ($766 a month), though switching means rebuilding software for arm64. The other variants are the c6a.16xlarge at $2.45, the c6gd.16xlarge at $2.46 and the c6i.16xlarge at $2.72.

Running it in N. Virginia instead of São Paulo saves $1,300 a month per instance: $3.23/hour against $5.01/hour, a 55% spread. It is not offered in Mumbai, so plan around that if you need a presence there.

Reserving it for a year with no upfront payment cuts the Linux rate to $2.03/hour, which beats on demand once it runs more than 63% of the time; three years brings it to $1.35/hour, 58% below on demand. Windows Server roughly doubles the bill at $6.17/hour, because the licence is charged per vCPU.

On demand it costs $3.23/hour in US East (N. Virginia), $2,355 a month if left running, which puts it mid-table for compute optimized types at the 58th percentile per vCPU ($0.0504 per vCPU-hour) and the 60th percentile per GiB ($0.0252 per GiB-hour).