c6a.12xlarge is AWS's compute-optimized EC2 size at 48 vCPU and 96 GiB. In the name, "c" stands for compute, "6" is the generation, "a" marks AMD processors and "12xlarge" is the size within the c6a family. It runs on AMD EPYC 7R13 Processor at 3.6 GHz, and AWS introduced it in February 2022. AWS has since shipped c7a, c8a and c9g; c7a.12xlarge is the direct replacement at this size, scoring 1,416,208 CoreMark/s against this instance's 1,014,156 — roughly 40% more throughput for the same vCPU count. The closest Spot shape is ch.vs1.2xlarge at 16 vCPU, so this instance maps to 3 of them — 48 vCPU and 96 GiB across the fleet, about 93% below the US East (N. Virginia) on-demand rate. 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 | $1.836 | $0.683 | $1.214 | $0.808 | $0.123 | $1.713 savings |
| US Central, Chicago | no AWS region | $0.033 | ||||
| US Central, Dallas | no AWS region | $0.333 | ||||
| Hong Kong | $2.333 | $1.543 | $1.058 | $0.123 | $2.210 savings | |
| Sydney, Australia | $2.398 | $0.956 | $1.583 | $1.089 | $0.123 | $2.275 savings |
| London, UK | $2.182 | $0.685 | $1.440 | $0.991 | $0.393 | $1.789 savings |
| US West, San Jose | $2.290 | $0.782 | $1.512 | $1.041 | $0.006 | $2.284 savings |
| US Central, Dallas 2 | no AWS region | $0.366 | ||||
| US East, N. Virginia 2 | $1.836 | $0.683 | $1.214 | $0.808 | $0.486 | $1.350 savings |