db.r8a.48xlargevsdb.r8g.48xlarge
db.r8g.48xlarge is 21% cheaper than db.r8a.48xlarge on demand in US East (N. Virginia), saving $4,408.03 a month. They use different processor architectures (x86_64 and arm64), so software built for one may need rebuilding to run on the other.
| At a glance | db.r8a.48xlarge | db.r8g.48xlarge |
|---|---|---|
| On-demand | $28.982/hr | $22.944/hr21% less |
| Lowest rate | $23.186/hr1-yr savings plan, hourly commitment | $18.355/hr21% less1-yr savings plan, hourly commitment |
| Size | 192 vCPUs, 1536 GiB | 192 vCPUs, 1536 GiB |
| Processor | 5th Generation AMD EPYC | AWS Graviton4 |
| Architecture | x86_64 | arm64 |
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.48xlarge | db.r8g.48xlarge | db.r8g.48xlarge vs db.r8a.48xlarge |
|---|---|---|---|
| On-demandPay by the hour | $28.982 | $22.944 | ▼ 21% |
| 1-yr reservedNo upfront | — | 33% off$15.372 | — |
| 3-yr reservedNo upfront | — | 53% off$10.784 | — |
| 1-yr savings planHourly commitment | 20% off$23.186 | 20% off$18.355 | ▼ 21% |
Key differences
The biggest lead each one has.
Where db.r8a.48xlarge leads
Sustained clock4.5 GHz vs 2.7 GHz
67% higherNetwork baseline75 Gbps vs 50 Gbps
50% higherEBS baseline bandwidth60,000 Mbps vs 40,000 Mbps
50% higherWhere db.r8g.48xlarge leads
On-demand price$22.944 vs $28.982 per hour
21% cheaperSpecs
13 of 24 specs differ. Those are in bold.
| Compute4 of 8 differ | db.r8a.48xlarge | db.r8g.48xlarge |
|---|---|---|
| vCPUs | 192 | 192 |
| Physical cores | 192 | 192 |
| Threads per core | 1 | 1 |
| Architecture | x86_64 | arm64 |
| Processor | 5th Generation AMD EPYC | AWS Graviton4 |
| CPU maker | AMD | AWS |
| Sustained clock | 4.5 GHz | 2.7 GHz |
| Burstable | No | No |
| MemoryAll 1 match | db.r8a.48xlarge | db.r8g.48xlarge |
|---|---|---|
| Memory (GiB) | 1,536 | 1,536 |
| Networking3 of 3 differ | db.r8a.48xlarge | db.r8g.48xlarge |
|---|---|---|
| Network | 75000 Mbps | 50 Gigabit |
| Network baseline | 75 Gbps | 50 Gbps |
| Network peak | 75 Gbps | 50 Gbps |
| Storage4 of 7 differ | db.r8a.48xlarge | db.r8g.48xlarge |
|---|---|---|
| Storage | EBS Only | EBS Only |
| EBS baseline bandwidth | 60,000 Mbps | 40,000 Mbps |
| EBS max bandwidth | 60,000 Mbps | 40,000 Mbps |
| EBS baseline throughput | 7,500 MB/s | 5,000 MB/s |
| EBS max throughput | 7,500 MB/s | 5,000 MB/s |
| EBS baseline IOPS | 240,000 | 240,000 |
| EBS max IOPS | 240,000 | 240,000 |
| Instance details1 of 4 differ | db.r8a.48xlarge | db.r8g.48xlarge |
|---|---|---|
| Family | r8a | r8g |
| Category | Memory optimized | Memory optimized |
| Current generation | Yes | Yes |
| Normalization factor | 768 | 768 |
| Other1 of 1 differ | db.r8a.48xlarge | db.r8g.48xlarge |
|---|---|---|
| Hardware Basis | r8a.48xlarge | r8g.48xlarge |
On-demand prices by region
Cheapest for db.r8a.48xlarge first. PostgreSQL, USD per hour.
| Region | db.r8a.48xlarge | db.r8g.48xlarge | Difference |
|---|---|---|---|
| US East (N. Virginia)Used in summaryus-east-1 | $28.982 | $22.944 | ▼ 21% |
| US East (Ohio)us-east-2 | $28.982 | $22.944 | ▼ 21% |
| US West (Oregon)us-west-2 | $28.982 | $22.944 | ▼ 21% |
| Canada (Central)ca-central-1 | $31.296 | $24.787 | ▼ 21% |
| EU (Ireland)eu-west-1 | $32.458 | $25.728 | ▼ 21% |
| Europe (Spain)eu-south-2 | $32.458 | $25.728 | ▼ 21% |
| Asia Pacific (Tokyo)ap-northeast-1 | $34.781 | $27.552 | ▼ 21% |
| EU (Frankfurt)eu-central-1 | $35.357 | $27.936 | ▼ 21% |
Keep exploring
Each type’s own page, and how it compares with others.
db.r8a.48xlarge
db.r8a.48xlarge prices and specsEvery size in the r8a familyCompare db.r8a.48xlarge with
db.r8g.48xlarge
db.r8g.48xlarge prices and specsEvery size in the r8g familyCompare db.r8g.48xlarge with
AWS RDS PostgreSQL prices in USD. Monthly figures use 730 hours. Prices last updated 12 Nov 2026.