r7iz.4xlargeAWS Pricing, Specs & Benchmarks

The r7iz family is a generation-7 memory-optimized line running on Intel Xeon (x86_64) — the explicit-Intel variant in a generation that also ships AMD and Graviton options. r7iz.4xlarge provides 16 vCPUs and 128GB of RAM (a 1:8 vCPU-to-memory ratio), priced at $1.4880/hr On-Demand — about $1071.36 per month at 24×7 utilization. In Sysbench CPU benchmarks it scores 3370 single-core and 27646 multi-core.

Memory-optimized instances are sized for in-memory databases (Redis, Memcached), real-time analytics, large caches, and any workload whose working set wants to fit in RAM. If your workload doesn't match that profile — for example, if you're running a memory-bound app on a compute-optimized instance, or a CPU-pegged batch job on a burstable t-series — you'll likely pay for capacity you can't use or run into bottlenecks you didn't anticipate. The pages for sibling families (linked further down) cover those alternatives in detail.

In the AWS instance-naming convention, the digit after the series letter is the generation — higher is newer. This appears to be one of AWS's newer generations in the series, so for most fresh workloads it's a reasonable default within its category. The family suffix tells you about hardware variants: "z" = highest single-thread frequency in the family.

Pricing varies by region (sometimes meaningfully — the gap between the cheapest and most expensive AWS region for the same SKU is often 15–30%). The regional pricing table further down shows where r7iz.4xlarge is cheapest today, both On-Demand and Spot. Spot pricing for r7iz.4xlarge is currently $0.5596/hr — roughly 62% off On-Demand — which makes the instance viable for fault-tolerant batch jobs, CI fleets, and any workload that can tolerate interruption with short notice.