c6id.12xlarge

Analysis

The c6id.12xlarge is a compute optimized instance in the c6id series with 48 vCPUs and 96 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.12xlarge on AWS Graviton2 costs $1.63/hour, 33% less ($575 a month), though switching means rebuilding software for arm64. The other variants are the c6a.12xlarge at $1.84, the c6gd.12xlarge at $1.84 and the c6i.12xlarge at $2.04.

Running it in N. Virginia instead of São Paulo saves $975 a month per instance: $2.42/hour against $3.75/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 $1.52/hour, which beats on demand once it runs more than 63% of the time; three years brings it to $1.01/hour, 58% below on demand. Windows Server roughly doubles the bill at $4.63/hour, because the licence is charged per vCPU.

On demand it costs $2.42/hour in US East (N. Virginia), $1,766 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).