aws-elasticache

On Aug 6, 2026 ElastiCache added Graviton4 M8g/R8g/C8gn for Valkey and Memcached — up to 47% higher throughput, 43% lower P99, 31% better price-performance vs Graviton3. Field guide: family pick, RI traps, canary checklist.

ElastiCache bills node-hours for Redis/Valkey clusters and ECPUs for Serverless. A cache.r7g.large with two replicas is 3× the primary node cost before data transfer. Serverless wins below ~$800/mo steady cache spend; provisioned nodes win above it.