c6a.16xlarge is AWS's compute-optimized EC2 size at 64 vCPU and 128 GiB. In the name, "c" stands for compute, "6" is the generation, "a" marks AMD processors and "16xlarge" 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.16xlarge is the direct replacement at this size, scoring 2,015,219 CoreMark/s against this instance's 1,332,501 — roughly 51% more throughput for the same vCPU count. The closest Spot shape is ch.vs1.2xlarge at 16 vCPU, so this instance maps to 4 of them — 64 vCPU and 128 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 | $2.448 | $0.902 | $1.619 | $1.078 | $0.164 | $2.284 savings |
| US Central, Chicago | no AWS region | $0.044 | ||||
| US Central, Dallas | no AWS region | $0.444 | ||||
| Hong Kong | $3.110 | $2.058 | $1.411 | $0.164 | $2.946 savings | |
| Sydney, Australia | $3.197 | $1.466 | $2.111 | $1.453 | $0.164 | $3.033 savings |
| London, UK | $2.909 | $1.138 | $1.920 | $1.322 | $0.524 | $2.385 savings |
| US West, San Jose | $3.053 | $1.029 | $2.016 | $1.388 | $0.008 | $3.045 savings |
| US Central, Dallas 2 | no AWS region | $0.488 | ||||
| US East, N. Virginia 2 | $2.448 | $0.902 | $1.619 | $1.078 | $0.648 | $1.800 savings |