c6id.4xlarge

Analysis

The c6id.4xlarge is a compute optimized instance in the c6id series with 16 vCPUs and 32 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.4xlarge on AWS Graviton2 costs $0.5440/hour, 33% less ($192 a month), though switching means rebuilding software for arm64. The other variants are the c6a.4xlarge at $0.6120, the c6gd.4xlarge at $0.6144 and the c6i.4xlarge at $0.6800.

Running it in N. Virginia instead of São Paulo saves $325 a month per instance: $0.8064/hour against $1.25/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 $0.5082/hour, which beats on demand once it runs more than 63% of the time; three years brings it to $0.3370/hour, 58% below on demand. Windows Server roughly doubles the bill at $1.54/hour, because the licence is charged per vCPU.

On demand it costs $0.8064/hour in US East (N. Virginia), $589 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).