c7i.4xlarge

Analysis

The c7i.4xlarge is a compute optimized instance in the c7i series with 16 vCPUs and 32 GiB of memory on Intel Xeon Scalable (Sapphire Rapids) (up to 3.2 GHz), which makes it compute-heavy at 2 GiB of memory per vCPU.

Within the same generation and size, the c7g.4xlarge on AWS Graviton3 costs $0.5800/hour, 19% less ($97.82 a month), though switching means rebuilding software for arm64. The other variants are the c7i-flex.4xlarge at $0.6783, the c7gd.4xlarge at $0.7258 and the c7a.4xlarge at $0.8211.

Running it in Mumbai instead of São Paulo saves $282 a month per instance: $0.7140/hour against $1.10/hour, a 54% spread.

Reserving it for a year with no upfront payment cuts the Linux rate to $0.4723/hour, which beats on demand once it runs more than 66% of the time; three years brings it to $0.3144/hour, 56% below on demand. Windows Server roughly doubles the bill at $1.45/hour, because the licence is charged per vCPU.

On demand it costs $0.7140/hour in US East (N. Virginia), $521 a month if left running, which puts it mid-table for compute optimized types at the 40th percentile per vCPU ($0.0446 per vCPU-hour) and the 44th percentile per GiB ($0.0223 per GiB-hour).

Compared with the previous generation, it costs 5.0% more than the c6i.4xlarge on Intel Xeon 8375C (Ice Lake) ($24.82 more a month per instance), in exchange for the newer processor. The newer c8i.4xlarge on Intel Xeon Scalable (Granite Rapids) is 5.0% dearer at $0.7497/hour.