c6in.8xlarge

Analysis

The c6in.8xlarge is a compute optimized instance in the c6in series with 32 vCPUs and 64 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.8xlarge on AWS Graviton2 costs $1.09/hour, 40% less ($530 a month), though switching means rebuilding software for arm64. The other variants are the c6a.8xlarge at $1.22, the c6gd.8xlarge at $1.23 and the c6i.8xlarge at $1.36.

Per vCPU it is one of the dearer compute optimized types: 78% of the 291 current types in the family cost less than its $0.0567 per vCPU-hour. The premium mostly pays for a newer processor or a specialised configuration. On demand it is $1.81/hour in US East (N. Virginia), or $1,325 for a 730-hour month.

Running it in Mumbai instead of São Paulo saves $711 a month per instance: $1.81/hour against $2.79/hour, a 54% spread.

Looking beyond its own line, 21 of 28 current types with 32 vCPUs and similar memory are cheaper. The cheapest of those is the c7g.8xlarge on AWS Graviton3 at $1.16/hour.

Reserving it for a year with no upfront payment cuts the Linux rate to $1.14/hour, which beats on demand once it runs more than 63% of the time; three years brings it to $0.6588/hour, 64% below on demand. Windows Server roughly adds 81% to the bill at $3.29/hour, because the licence is charged per vCPU.