c8i-flex.16xlarge
Compute optimized · c8i-flex series · Intel Xeon Scalable (Granite Rapids)
- vCPU
- 64
- Memory
- 128 GiB
- Linux / hour
- $2.85
- Per month
- $2,080
- Per vCPU-hour
- $0.0445
- Per GiB-hour
- $0.0223
Analysis
The c8i-flex.16xlarge is a compute optimized instance in the c8i-flex series with 64 vCPUs and 128 GiB of memory on Intel Xeon Scalable (Granite Rapids) (up to 3.9 GHz), which makes it compute-heavy at 2 GiB of memory per vCPU.
Within the same generation and size, the c8g.16xlarge on AWS Graviton4 costs $2.55/hour, 10% less ($216 a month), though switching means rebuilding software for arm64. The other variants are the c8i.16xlarge at $3.00, the c8gd.16xlarge at $3.14 and the c8a.16xlarge at $3.45.
Running it in Mumbai instead of São Paulo saves $1,126 a month per instance: $2.85/hour against $4.39/hour, a 54% spread.
On demand it costs $2.85/hour in US East (N. Virginia), $2,080 a month if left running, which puts it mid-table for compute optimized types at the 38th percentile per vCPU ($0.0445 per vCPU-hour) and the 41st percentile per GiB ($0.0223 per GiB-hour).
Windows Server roughly doubles the bill at $5.65/hour, because the licence is charged per vCPU.
Compared with the previous generation, it costs 5.0% more than the c7i-flex.16xlarge on Intel Xeon Scalable (Sapphire Rapids) ($98.87 more a month per instance), in exchange for the newer processor.
Looking beyond its own line, 12 of 28 current types with 64 vCPUs and similar memory are cheaper. The cheapest of those is the hpc7g.16xlarge on AWS Graviton3 at $1.68/hour.
Price by region (USD per hour)
| Region | Linux | Windows | 1-yr RI | 3-yr RI | |
|---|---|---|---|---|---|
| N. Virginia us-east-1 | $2.85 | $5.65 | – | – | |
| Ohio us-east-2 | $2.85 | $5.65 | – | – | |
| Oregon us-west-2 | $2.85 | $5.65 | – | – | |
| Canada Central ca-central-1 | $3.12 | $5.91 | – | – | |
| São Paulo sa-east-1 | $4.39 | $7.19 | – | – | |
| Ireland eu-west-1 | $3.06 | $5.85 | – | – | |
| London eu-west-2 | $3.38 | $6.18 | – | – | |
| Frankfurt eu-central-1 | $3.25 | $6.05 | – | – | |
| Mumbai ap-south-1 | $2.85 | $5.65 | – | – | |
| Singapore ap-southeast-1 | $3.28 | $6.08 | – | – | |
| Sydney ap-southeast-2 | $3.72 | $6.52 | – | – | |
| Tokyo ap-northeast-1 | $3.59 | $6.38 | – | – |
Shared tenancy, no pre-installed software. Reserved rates are standard, no upfront, per hour. Prices as of 2026-11-04.
Same shape, other types
| Type | vCPU | Memory | $/hour | vs c8i-flex.16xlarge |
|---|---|---|---|---|
| hpc7g.16xlarge AWS Graviton3 Processor | 64 | 128 GiB | $1.68 | -41% |
| c6g.16xlarge AWS Graviton2 Processor | 64 | 128 GiB | $2.18 | -24% |
| c7g.16xlarge AWS Graviton3 Processor | 64 | 128 GiB | $2.32 | -19% |
| c6a.16xlarge AMD EPYC 7R13 Processor | 64 | 128 GiB | $2.45 | -14% |
| c6gd.16xlarge AWS Graviton2 Processor | 64 | 128 GiB | $2.46 | -14% |
| c5a.16xlarge AMD EPYC 7R32 | 64 | 128 GiB | $2.46 | -14% |
Cost calculator
Specs
| vCPU | 64 |
|---|---|
| Memory | 128 GiB (2.0 per vCPU) |
| Processor | Intel Xeon Scalable (Granite Rapids) |
| Clock | 3.9 GHz |
| Storage | EBS only |
| Network | Up to 30000 Megabit |
c8i-flex sizes
| c8i-flex.large | 2 vCPU | $0.0890 |
| c8i-flex.xlarge | 4 vCPU | $0.1780 |
| c8i-flex.2xlarge | 8 vCPU | $0.3561 |
| c8i-flex.4xlarge | 16 vCPU | $0.7122 |
| c8i-flex.8xlarge | 32 vCPU | $1.42 |
| c8i-flex.12xlarge | 48 vCPU | $2.14 |
| c8i-flex.16xlarge | 64 vCPU | $2.85 |