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r8i-flex.r8i-flex.large

Custom Intel Xeon 6 processors (Granite Rapids) with a sustained all-core turbo frequency of 3.9 GHz Memory-optimized "Flex" instance, designed for workloads that do not fully utilize all compute resources, offering up to 5% better price-performance than R8i and a baseline CPU performance of 40% with the ability to burst to 100% CPU performance 95% of the time over a 24-hour period. It uses DDR5 7200MT/s memory for 2.5x higher memory throughput and features 4.6x larger L3 cache compared to the previous generation. It is built on the AWS Nitro System

available for self-hosted runners on RunsOn
cpu speed · passmark single-thread
3,193pts
Intel(R) Xeon(R) 6975P-C (x86_64)
averaged over many days · higher is faster
vcpus
2
physical threads
memory
15.3 GiB
ram
clock speed
3.9 GHz
max frequency
architecture
x86_64
x86_64

EC2 instance family: r8i-flex

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

r8i-flex memory optimized
cpu type
Intel Xeon Scalable (Granite Rapids) — Custom Intel Xeon 6 processors (Granite Rapids) with a sustained all-core turbo frequency of 3.9 GHz
architecture
x86_64 · x86_64
highlights
Memory-optimized "Flex" instance, designed for workloads that do not fully utilize all compute resources, offering up to 5% better price-performance than R8i and a baseline CPU performance of 40% with the ability to burst to 100% CPU performance 95% of the time over a 24-hour period. It uses DDR5 7200MT/s memory for 2.5x higher memory throughput and features 4.6x larger L3 cache compared to the previous generation. It is built on the AWS Nitro System
released
August 2025
.github/workflows/ci.yml yaml 
jobs:
  build:
    runs-on:
      - runs-on=${{ github.run_id }}
      - family=r8i-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
spot · avg $0.0531/hr
on-demand$0.1320
savings vs on-demand56%
spot interrupt freq >20%
US
Oregon
us-west-2
spot · avg $0.0495/hr
on-demand$0.1320
savings vs on-demand60%
spot interrupt freq <5%
IE
Ireland
eu-west-1
spot · avg $0.0708/hr
on-demand$0.1477
savings vs on-demand54%
spot interrupt freq <5%
DE
Frankfurt
eu-central-1
best spot
spot · avg $0.0613/hr
on-demand$0.1592
savings vs on-demand67%
spot interrupt freq 15-20%

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 r8i-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 r8i-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