db.r8a.xlargevsdb.r8i.xlarge
db.r8i.xlarge is 12% cheaper than db.r8a.xlarge on demand in US East (N. Virginia), saving $53.87 a month.
| At a glance | db.r8a.xlarge | db.r8i.xlarge |
|---|---|---|
| On-demand | $0.6038/hr | $0.53/hr12% less |
| Lowest rate | $0.483/hr1-yr savings plan, hourly commitment | $0.424/hr12% less1-yr savings plan, hourly commitment |
| Size | 4 vCPUs, 32 GiB | 4 vCPUs, 32 GiB |
Prices in US East (N. Virginia)
“Off” is the discount against each type’s own on-demand price. PostgreSQL, USD per hour.
| Option | db.r8a.xlarge | db.r8i.xlarge | db.r8i.xlarge vs db.r8a.xlarge |
|---|---|---|---|
| On-demandPay by the hour | $0.6038 | $0.53 | ▼ 12% |
| 1-yr reservedNo upfront | — | 33% off$0.3551 | — |
| 3-yr reservedNo upfront | — | 53% off$0.2491 | — |
| 1-yr savings planHourly commitment | 20% off$0.483 | 20% off$0.424 | ▼ 12% |
Key differences
The biggest lead each one has.
Where db.r8a.xlarge leads
Physical cores4 vs 2
2× higherWhere db.r8i.xlarge leads
On-demand price$0.53 vs $0.6038 per hour
12% cheaperSpecs
12 of 23 specs differ. Those are in bold.
| Compute6 of 8 differ | db.r8a.xlarge | db.r8i.xlarge |
|---|---|---|
| vCPUs | 4 | 4 |
| Physical cores | 4 | 2 |
| Threads per core | 1 | 2 |
| Architecture | – | x86_64 |
| Processor | – | Intel Xeon Scalable (Granite Rapids) |
| CPU maker | AMD | Intel |
| Sustained clock | 4.5 GHz | 3.9 GHz |
| Burstable | No | No |
| MemoryAll 1 match | db.r8a.xlarge | db.r8i.xlarge |
|---|---|---|
| Memory (GiB) | 32 | 32 |
| Networking1 of 3 differ | db.r8a.xlarge | db.r8i.xlarge |
|---|---|---|
| Network | – | Up to 12500 Megabit |
| Network baseline | 1.875 Gbps | 1.875 Gbps |
| Network peak | 12.5 Gbps | 12.5 Gbps |
| Storage1 of 7 differ | db.r8a.xlarge | db.r8i.xlarge |
|---|---|---|
| Storage | – | EBS Only |
| EBS baseline bandwidth | 1,250 Mbps | 1,250 Mbps |
| EBS max bandwidth | 10,000 Mbps | 10,000 Mbps |
| EBS baseline throughput | 156.25 MB/s | 156.25 MB/s |
| EBS max throughput | 1,250 MB/s | 1,250 MB/s |
| EBS baseline IOPS | 6,000 | 6,000 |
| EBS max IOPS | 40,000 | 40,000 |
| Instance details3 of 3 differ | db.r8a.xlarge | db.r8i.xlarge |
|---|---|---|
| Family | r8a | r8i |
| Category | – | Memory optimized |
| Current generation | – | Yes |
| Other1 of 1 differ | db.r8a.xlarge | db.r8i.xlarge |
|---|---|---|
| Hardware Basis | r8a.xlarge | r8i.xlarge |
On-demand prices by region
Cheapest for db.r8a.xlarge first. PostgreSQL, USD per hour.
| Region | db.r8a.xlarge | db.r8i.xlarge | Difference |
|---|---|---|---|
| US East (N. Virginia)Used in summaryus-east-1 | $0.6038 | $0.53 | ▼ 12% |
| US East (Ohio)us-east-2 | $0.6038 | $0.53 | ▼ 12% |
| US West (Oregon)us-west-2 | $0.6038 | $0.53 | ▼ 12% |
| Canada (Central)ca-central-1 | $0.652 | $0.57 | ▼ 13% |
| EU (Ireland)eu-west-1 | $0.6762 | $0.59 | ▼ 13% |
| Europe (Spain)eu-south-2 | $0.6762 | $0.59 | ▼ 13% |
| Asia Pacific (Tokyo)ap-northeast-1 | $0.7246 | $0.63 | ▼ 13% |
| EU (Frankfurt)eu-central-1 | $0.7366 | $0.64 | ▼ 13% |
Keep exploring
Each type’s own page, and how it compares with others.
AWS RDS PostgreSQL prices in USD. Monthly figures use 730 hours. Prices last updated 12 Nov 2026.