c8i-flex.4xlarge
Compute optimized · c8i-flex series · Intel Xeon Scalable (Granite Rapids)
- vCPU
- 16
- Memory
- 32 GiB
- Linux / hour
- $0.7122
- Per month
- $520
- Per vCPU-hour
- $0.0445
- Per GiB-hour
- $0.0223
Analysis
The c8i-flex.4xlarge is a compute optimized instance in the c8i-flex series with 16 vCPUs and 32 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.4xlarge on AWS Graviton4 costs $0.6381/hour, 10% less ($54.08 a month), though switching means rebuilding software for arm64. The other variants are the c8i.4xlarge at $0.7497, the c8gd.4xlarge at $0.7838 and the c8a.4xlarge at $0.8622.
Running it in Mumbai instead of São Paulo saves $281 a month per instance: $0.7122/hour against $1.10/hour, a 54% spread.
On demand it costs $0.7122/hour in US East (N. Virginia), $520 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 $1.41/hour, because the licence is charged per vCPU.
Compared with the previous generation, it costs 5.0% more than the c7i-flex.4xlarge on Intel Xeon Scalable (Sapphire Rapids) ($24.72 more a month per instance), in exchange for the newer processor.
Looking beyond its own line, 12 of 31 current types with 16 vCPUs and similar memory are cheaper. The cheapest of those is the c6g.4xlarge on AWS Graviton2 at $0.5440/hour.
Price by region (USD per hour)
| Region | Linux | Windows | 1-yr RI | 3-yr RI | |
|---|---|---|---|---|---|
| N. Virginia us-east-1 | $0.7122 | $1.41 | – | – | |
| Ohio us-east-2 | $0.7122 | $1.41 | – | – | |
| Oregon us-west-2 | $0.7122 | $1.41 | – | – | |
| Canada Central ca-central-1 | $0.7792 | $1.48 | – | – | |
| São Paulo sa-east-1 | $1.10 | $1.80 | – | – | |
| Ireland eu-west-1 | $0.7642 | $1.46 | – | – | |
| London eu-west-2 | $0.8462 | $1.55 | – | – | |
| Frankfurt eu-central-1 | $0.8127 | $1.51 | – | – | |
| Mumbai ap-south-1 | $0.7122 | $1.41 | – | – | |
| Singapore ap-southeast-1 | $0.8212 | $1.52 | – | – | |
| Sydney ap-southeast-2 | $0.9301 | $1.63 | – | – | |
| Tokyo ap-northeast-1 | $0.8966 | $1.60 | – | – |
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.4xlarge |
|---|---|---|---|---|
| c6g.4xlarge AWS Graviton2 Processor | 16 | 32 GiB | $0.5440 | -24% |
| c7g.4xlarge AWS Graviton3 Processor | 16 | 32 GiB | $0.5800 | -19% |
| c6a.4xlarge AMD EPYC 7R13 Processor | 16 | 32 GiB | $0.6120 | -14% |
| c6gd.4xlarge AWS Graviton2 Processor | 16 | 32 GiB | $0.6144 | -14% |
| c5a.4xlarge AMD EPYC 7R32 | 16 | 32 GiB | $0.6160 | -14% |
| c8g.4xlarge AWS Graviton4 Processor | 16 | 32 GiB | $0.6381 | -10% |
Cost calculator
Specs
| vCPU | 16 |
|---|---|
| Memory | 32 GiB (2.0 per vCPU) |
| Processor | Intel Xeon Scalable (Granite Rapids) |
| Clock | 3.9 GHz |
| Storage | EBS only |
| Network | Up to 15000 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 |