db.r8a.24xlargevsdb.r8g.24xlarge
db.r8g.24xlarge is 21% cheaper than db.r8a.24xlarge on demand in US East (N. Virginia), saving $2,204.02 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.24xlarge | db.r8g.24xlarge |
|---|---|---|
| On-demand | $14.491/hr | $11.472/hr21% less |
| Lowest rate | $11.593/hr1-yr savings plan, hourly commitment | $9.178/hr21% less1-yr savings plan, hourly commitment |
| Size | 96 vCPUs, 768 GiB | 96 vCPUs, 768 GiB |
| 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.24xlarge | db.r8g.24xlarge | db.r8g.24xlarge vs db.r8a.24xlarge |
|---|---|---|---|
| On-demandPay by the hour | $14.491 | $11.472 | ▼ 21% |
| 1-yr reservedNo upfront | — | 33% off$7.686 | — |
| 3-yr reservedNo upfront | — | 53% off$5.392 | — |
| 1-yr savings planHourly commitment | 20% off$11.593 | 20% off$9.178 | ▼ 21% |
Key differences
The biggest lead each one has.
Where db.r8a.24xlarge leads
Sustained clock4.5 GHz vs 2.8 GHz
61% higherWhere db.r8g.24xlarge leads
On-demand price$11.472 vs $14.491 per hour
21% cheaperSpecs
14 of 27 specs differ. Those are in bold.
| Compute6 of 10 differ | db.r8a.24xlarge | db.r8g.24xlarge |
|---|---|---|
| vCPUs | 96 | 96 |
| Physical cores | 96 | 96 |
| Threads per core | 1 | 1 |
| Architecture | x86_64 | arm64 |
| Processor | AMD EPYC 9R45 Processor | – |
| CPU maker | AMD | AWS |
| Clock speed | Up to 4.5 GHz | – |
| Sustained clock | 4.5 GHz | 2.8 GHz |
| Processor features | AMD Turbo; AVX; AVX2; AVX512 | – |
| Burstable | No | No |
| MemoryAll 1 match | db.r8a.24xlarge | db.r8g.24xlarge |
|---|---|---|
| Memory (GiB) | 768 | 768 |
| Networking1 of 3 differ | db.r8a.24xlarge | db.r8g.24xlarge |
|---|---|---|
| Network | 40000 Megabit | – |
| Network baseline | 40 Gbps | 40 Gbps |
| Network peak | 40 Gbps | 40 Gbps |
| Storage2 of 8 differ | db.r8a.24xlarge | db.r8g.24xlarge |
|---|---|---|
| Storage | Aurora IO Optimization Mode | – |
| EBS throughput | 30000 Mbps | – |
| EBS baseline bandwidth | 30,000 Mbps | 30,000 Mbps |
| EBS max bandwidth | 30,000 Mbps | 30,000 Mbps |
| EBS baseline throughput | 3,750 MB/s | 3,750 MB/s |
| EBS max throughput | 3,750 MB/s | 3,750 MB/s |
| EBS baseline IOPS | 120,000 | 120,000 |
| EBS max IOPS | 120,000 | 120,000 |
| Instance details4 of 4 differ | db.r8a.24xlarge | db.r8g.24xlarge |
|---|---|---|
| Family | r8a | r8g |
| Category | Memory optimized | – |
| Current generation | Yes | – |
| Normalization factor | 249.6 | 192 |
| Other1 of 1 differ | db.r8a.24xlarge | db.r8g.24xlarge |
|---|---|---|
| Hardware Basis | r8a.24xlarge | r8g.24xlarge |
On-demand prices by region
Cheapest for db.r8a.24xlarge first. PostgreSQL, USD per hour.
| Region | db.r8a.24xlarge | db.r8g.24xlarge | Difference |
|---|---|---|---|
| US East (N. Virginia)Used in summaryus-east-1 | $14.491 | $11.472 | ▼ 21% |
| US East (Ohio)us-east-2 | $14.491 | $11.472 | ▼ 21% |
| US West (Oregon)us-west-2 | $14.491 | $11.472 | ▼ 21% |
| Canada (Central)ca-central-1 | $15.648 | $12.394 | ▼ 21% |
| EU (Ireland)eu-west-1 | $16.229 | $12.864 | ▼ 21% |
| Europe (Spain)eu-south-2 | $16.229 | $12.864 | ▼ 21% |
| Asia Pacific (Tokyo)ap-northeast-1 | $17.39 | $13.776 | ▼ 21% |
| EU (Frankfurt)eu-central-1 | $17.678 | $13.968 | ▼ 21% |
Keep exploring
Each type’s own page, and how it compares with others.
db.r8a.24xlarge
db.r8a.24xlarge prices and specsEvery size in the r8a familyCompare db.r8a.24xlarge with
db.r8g.24xlarge
db.r8g.24xlarge prices and specsEvery size in the r8g familyCompare db.r8g.24xlarge with
AWS RDS PostgreSQL prices in USD. Monthly figures use 730 hours. Prices last updated 12 Nov 2026.