The c8gn.48xlarge is a compute-optimized AWS EC2 instance: 192 vCPU and 384 GiB of memory, 2.00 GiB per vCPU. In the name, "c" stands for compute, "8" is the generation, "gn" marks AWS Graviton (ARM) processors and enhanced networking and "48xlarge" is the size within the c8gn family. It runs on AWS Graviton4 Processor at 2.8 GHz, and AWS introduced it in June 2025. AWS has since shipped c9g; c9g.48xlarge is the direct replacement at this size, scoring 6,868,181 CoreMark/s against this instance's 5,220,228 — roughly 32% more throughput for the same vCPU count. No single Spot node covers 192 vCPU and 384 GiB, so the equivalent is a fleet: 12 × ch.vs1.2xlarge, 192 vCPU and 384 GiB in total, $11.38/hr on AWS in US East (N. Virginia), from $0.492/hr on Rackspace Spot. Spot delivers compute as managed Kubernetes, so a node pool of that size is the native shape of the answer rather than a workaround — provided the workload scales horizontally.
| Region | AWS on-demand | AWS Spot | 1-yr Reserved | 3-yr Reserved | Rackspace Spot | You save |
|---|---|---|---|---|---|---|
| US East, N. Virginia | $11.376 | $1.529 | $0.492 | $10.884 savings | ||
| US Central, Chicago | no AWS region | $0.132 | ||||
| US Central, Dallas | no AWS region | $1.332 | ||||
| Hong Kong | $15.062 | $0.492 | $14.570 savings | |||
| Sydney, Australia | $14.853 | $5.647 | $0.492 | $14.361 savings | ||
| London, UK | $13.482 | $1.847 | $1.572 | $11.910 savings | ||
| US West, San Jose | $14.220 | $1.663 | $0.024 | $14.196 savings | ||
| US Central, Dallas 2 | no AWS region | $1.464 | ||||
| US East, N. Virginia 2 | $11.376 | $1.529 | $1.944 | $9.432 savings |