r8i-flex.4xlarge pricing and specs in EU (Ireland)
16 vCPU · 128 GiB · Up to 15 Gigabit · Intel Xeon Scalable (Granite Rapids)
$1.1814/hour on-demand · $862/month (Linux, Shared)
r8i-flex.4xlarge is a memory-optimized EC2 instance with 16 vCPU and 128 GiB, generation 8 of the r family. On-demand it costs $1.1814 an hour, about $862 a month if it runs all month. A one-year commitment with nothing up front works out at $0.7815 an hour and pays for itself above roughly 482 hours a month; below that, on-demand is cheaper. The three-year options go down to $0.5359 an hour, 55% below on-demand. The newer r8g.4xlarge offers the same size for $1.0547 an hour, 11% less and moves to Graviton. Across regions the cheapest place to run r8i-flex.4xlarge is US East (N. Virginia) (us-east-1) at $1.0558 an hour, 11% below EU (Ireland).
Pricing by OS (hourly, USD, Shared)
| Option | Linux | Windows | RHEL | SUSE | Ubuntu Pro |
|---|---|---|---|---|---|
| On-Demand | $1.1814 | $1.8806 | $1.3542 | $1.3064 | $1.2094 |
| Spot | $0.5420 | $0.9782 | — | — | — |
| 1y Compute SP NU | $0.8559 | $1.5552 | $1.0288 | $0.9159 | $0.8783 |
| 3y Compute SP NU | $0.6163 | $1.3155 | $0.7891 | $0.6703 | $0.6345 |
| 1y EC2 SP NU | $0.7815 | $1.4807 | $0.9543 | $0.8414 | $0.8039 |
| 3y EC2 SP NU | $0.5359 | $1.2351 | $0.7087 | $0.5899 | $0.5541 |
Spot by AZ (7-day p50, Linux): eu-west-1b $0.4815 · eu-west-1c $0.5420 · eu-west-1a $0.5431
Newer generations of the same size
Same family letter and size in a newer generation, ranked by price. “vCPU per $” uses vCPU as the performance proxy — newer chips usually add more, so it is a floor.
Graviton-eligible → r8g.4xlarge (-11%)| Type | $/h | Price Δ | vCPU per $ Δ | Saves / mo |
|---|---|---|---|---|
| r8g.4xlarge Graviton arch change | $1.0547 | -11% | +12% | $93 |
| r8i.4xlarge | $1.2436 | +5% | -5% | $-45 |
| r8gd.4xlarge Graviton arch change | $1.3064 | +11% | -10% | $-91 |
| r8a.4xlarge | $1.4302 | +21% | -17% | $-182 |
| r8id.4xlarge | $1.4784 | +25% | -20% | $-217 |
| r8ib.4xlarge | $1.8758 | +59% | -37% | $-507 |
| r8in.4xlarge | $1.8758 | +59% | -37% | $-507 |
| r8idb.4xlarge | $2.0891 | +77% | -43% | $-663 |
Cheapest regions for r8i-flex.4xlarge
| Region | On-Demand $/h | vs eu-west-1 | Saves / mo |
|---|---|---|---|
| US East (N. Virginia) us-east-1 | $1.0558 | -11% | $92 |
| US East (Ohio) us-east-2 | $1.0558 | -11% | $92 |
| US West (Oregon) us-west-2 | $1.0558 | -11% | $92 |
| Asia Pacific (Malaysia) ap-southeast-5 | $1.0826 | -8% | $72 |
| Asia Pacific (Mumbai) ap-south-1 | $1.0893 | -8% | $67 |
| Asia Pacific (Hyderabad) ap-south-2 | $1.0893 | -8% | $67 |
Caveat: instance price is only part of the bill. Cross-region and internet data transfer, latency to your users, data-residency rules and service availability can outweigh a few percent on compute.
Price history (eu-west-1)
Daily snapshots since the catalog started tracking this type; a row is added whenever a headline price changes.
| Date | OD Linux | OD Windows | 1y RI | 3y RI | Spot p50 |
|---|---|---|---|---|---|
| 2026-10-22 | $1.1814 | $1.8806 | — | — | $0.5420 |
| 2026-10-21 | $1.1814 | $1.8806 | — | — | $0.5425 |
| 2026-10-20 | $1.1814 | $1.8806 | — | — | $0.5428 |
| 2026-10-19 | $1.1814 | $1.8806 | — | — | $0.5441 |
| 2026-10-18 | $1.1814 | $1.8806 | — | — | $0.5443 |
| 2026-10-17 | $1.1814 | $1.8806 | — | — | $0.5428 |
| 2026-10-16 | $1.1814 | $1.8806 | — | — | $0.5390 |
| 2026-10-15 | $1.1814 | $1.8806 | — | — | $0.5358 |
| 2026-10-14 | $1.1814 | $1.8806 | — | — | $0.5321 |
| 2026-10-13 | $1.1814 | $1.8806 | — | — | $0.5209 |
| 2026-10-09 | $1.1814 | $1.8806 | — | — | $0.5147 |
| 2026-10-08 | $1.1814 | $1.8806 | — | — | $0.5326 |
| 2026-10-07 | $1.1814 | $1.8806 | — | — | $0.5501 |
| 2026-10-06 | $1.1814 | $1.8806 | — | — | $0.5547 |
| 2026-10-05 | $1.1814 | $1.8806 | — | — | $0.5588 |
| 2026-10-04 | $1.1814 | $1.8806 | — | — | $0.5593 |
| 2026-10-03 | $1.1814 | $1.8806 | — | — | $0.5621 |
| 2026-10-02 | $1.1814 | $1.8806 | — | — | $0.5676 |
| 2026-10-01 | $1.1814 | $1.8806 | — | — | $0.5688 |
| 2026-09-30 | $1.1814 | $1.8806 | — | — | $0.5694 |
| 2026-09-29 | $1.1814 | $1.8806 | — | — | $0.5697 |
| 2026-09-28 | $1.1814 | $1.8806 | — | — | $0.5683 |
| 2026-09-27 | $1.1814 | $1.8806 | — | — | $0.5669 |
| 2026-09-26 | $1.1814 | $1.8806 | — | — | $0.5665 |
| 2026-09-25 | $1.1814 | $1.8806 | — | — | $0.5619 |
| 2026-09-22 | $1.1814 | $1.8806 | — | — | $0.5586 |
All attributes
- vCPU
- 16
- Cores / threads per core
- 8 / 2
- Memory
- 128 GiB
- Memory per vCPU
- 8.00 GiB
- Processor
- Intel Xeon Scalable (Granite Rapids)
- Architecture
- x86_64
- Sustained clock
- 3.9 GHz
- Hypervisor
- nitro
- Generation
- Current
- Burstable
- No
- Bare metal
- No
- Free tier eligible
- No
- Network performance
- Up to 15 Gigabit
- Network baseline / burst
- 3.75 / 15.0 Gbps
- Max ENIs × IPv4 per ENI
- 8 × 50
- IPv6 / ENA / EFA
- IPv6 / ENA / —
- EBS optimized
- Yes
- EBS bandwidth (baseline / max)
- 2500 / 10000 Mbps
- EBS IOPS (baseline / max)
- 12,000 / 40000
- EBS NVMe
- required
- Instance storage
- EBS only
- GPU
- —
- Placement groups
- partition, spread
- Hibernation / Nitro Enclaves
- Yes / No
- Dedicated hosts
- —
- Boot modes
- legacy-bios, uefi
- Spot supported
- Yes
Public AWS list prices (USD), refreshed nightly (catalog 2026-10-22). RI and Savings Plan rates are effective hourly (upfront amortised over the term) and are charged for every hour of the term. Excludes taxes, data transfer and storage. How these numbers are sourced and checked. Not affiliated with Amazon Web Services.
List prices are where it starts. Your bill is where it matters.
TruCost reads your actual AWS usage and tells you which of these commitments you should really buy, what your idle capacity costs, and where every dollar of the bill goes. Thirty minutes on your own data.