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c7i-flex.c7i-flex.large

Custom 4th Generation Intel Xeon Scalable Processors (Sapphire Rapids), exclusive to AWS These are compute-optimized Flex instances designed for workloads that do not require continuous full CPU utilization. They offer a baseline level of CPU performance but can scale up to full compute performance 95% of the time. They utilize DDR5 memory and provide up to 19% better price performance compared to C6i instances

available for self-hosted runners on RunsOn
cpu speed · passmark single-thread
2,672pts
Intel(R) Xeon(R) Platinum 8488C (x86_64)
averaged over many days · higher is faster
vcpus
2
physical threads
memory
3.7 GiB
ram
clock speed
3.2 GHz
max frequency
architecture
x86_64
x86_64

EC2 instance family: c7i-flex

What the family is built for, the silicon underneath, and how to ask RunsOn for it.

c7i-flex compute optimized
cpu type
Intel Xeon Scalable (Sapphire Rapids) — Custom 4th Generation Intel Xeon Scalable Processors (Sapphire Rapids), exclusive to AWS
architecture
x86_64 · x86_64
highlights
These are compute-optimized Flex instances designed for workloads that do not require continuous full CPU utilization. They offer a baseline level of CPU performance but can scale up to full compute performance 95% of the time. They utilize DDR5 memory and provide up to 19% better price performance compared to C6i instances
released
May 14, 2024 (General Availability announcement)
.github/workflows/ci.yml yaml 
jobs:
  build:
    runs-on:
      - runs-on=${{ github.run_id }}
      - family=c7i-flex
      - cpu=2
the label is a query — each line one constraint, resolved at launch. job labels →

Availability & price by region

Spot is the average price RunsOn pays in your own AWS account — no per-minute markup. The bar shows how far under on-demand each region runs; the badge is the observed spot-interruption frequency.

US
N. Virginia
us-east-1
best spot
spot · avg $0.0314/hr
on-demand$0.0848
savings vs on-demand63%
spot interrupt freq 5-10%
US
Oregon
us-west-2
best spot
spot · avg $0.0303/hr
on-demand$0.0848
savings vs on-demand63%
spot interrupt freq 10-15%
IE
Ireland
eu-west-1
spot · avg $0.0426/hr
on-demand$0.0910
savings vs on-demand47%
spot interrupt freq 5-10%
DE
Frankfurt
eu-central-1
spot · avg $0.0413/hr
on-demand$0.0968
savings vs on-demand57%
spot interrupt freq 5-10%

Spot prices are trailing averages per region and move with the market. On-demand is the list reference. Interrupt frequency is AWS's published spot-advisor band for this instance type.

About these benchmarks

CPU is the Passmark single-thread metric, run on a live c7i-flex.large instance and averaged over many days so a single noisy run can't skew the score.

Pricing is normalized to the hourly rate AWS bills, then shown per region. Spot is the trailing average; savings is measured against the same region's on-demand list price.

This instance is launched the exact same way any RunsOn job launches it — ephemeral EC2 in your account, one CloudFormation stack, nothing to babysit.

metricpassmark · single-thread
samples21 runs
regions4 · us-east-1, us-west-2, eu-west-1, eu-central-1
last updatedAugust 2, 2026

Run c7i-flex.large in your own account.

The benchmark runs on the same RunsOn anyone can deploy. One CloudFormation stack, your AWS account, ~10 minutes.

self-host → ← all ec2 instances