r8idb.xlarge

Analysis

The r8idb.xlarge is a memory optimized instance in the r8idb series with 4 vCPUs and 32 GiB of memory on Intel Xeon Scalable (Granite Rapids) (up to 3.9 GHz), which makes it memory-heavy at 8 GiB of memory per vCPU.

Within the same generation and size, the r8g.xlarge on AWS Graviton4 costs $0.2356/hour, 50% less ($170 a month), though switching means rebuilding software for arm64. The other variants are the r8i-flex.xlarge at $0.2639, the r8i.xlarge at $0.2778 and the r8gd.xlarge at $0.2939.

Running it in N. Virginia instead of Tokyo saves $73.79 a month per instance: $0.4689/hour against $0.5700/hour, a 22% spread. It is not offered in Canada Central, São Paulo, London, Mumbai, Singapore and Sydney, so plan around that if you need a presence there.

Per vCPU it is one of the dearer memory optimized types: 89% of the 385 current types in the family cost less than its $0.1172 per vCPU-hour. The premium mostly pays for the local NVMe disk. On demand it is $0.4689/hour in US East (N. Virginia), or $342 for a 730-hour month.

Looking beyond its own line, 39 of 45 current types with 4 vCPUs and similar memory are cheaper. The cheapest of those is the r6g.xlarge on AWS Graviton2 at $0.2016/hour.