db.m8g.4xlargevsdb.m8i.4xlarge
db.m8g.4xlarge is 10% cheaper than db.m8i.4xlarge on demand in US East (N. Virginia), saving $113.88 a month. Per vCPU, db.m8g.4xlarge costs 55% less. They use different processor architectures (arm64 and x86_64), so software built for one may need rebuilding to run on the other.
| At a glance | db.m8g.4xlarge | db.m8i.4xlarge |
|---|---|---|
| On-demand | $1.344/hr10% less | $1.50/hr |
| Lowest rate | $0.6316/hr10% less3-yr reserved, no upfront | $0.705/hr3-yr reserved, no upfront |
| Size | 16 vCPUs, 64 GiB | 8 vCPUs, 64 GiB |
| Processor | AWS Graviton4 | Intel Xeon Scalable (Granite Rapids) |
| Architecture | arm64 | x86_64 |
Prices in US East (N. Virginia)
“Off” is the discount against each type’s own on-demand price. PostgreSQL, USD per hour.
| Option | db.m8g.4xlarge | db.m8i.4xlarge | db.m8i.4xlarge vs db.m8g.4xlarge |
|---|---|---|---|
| On-demandPay by the hour | $1.344 | $1.50 | ▲ 12% |
| 1-yr reservedNo upfront | 33% off$0.9 | 33% off$1.005 | ▲ 12% |
| 3-yr reservedNo upfront | 53% off$0.6316 | 53% off$0.705 | ▲ 12% |
| 1-yr savings planHourly commitment | 20% off$1.075 | 20% off$1.20 | ▲ 12% |
Key differences
The biggest lead each one has.
Where db.m8g.4xlarge leads
On-demand price$1.344 vs $1.50 per hour
10% cheapervCPUs16 vs 8
2× higherWhere db.m8i.4xlarge leads
Sustained clock3.9 GHz vs 2.8 GHz
39% higherSpecs
11 of 24 specs differ. Those are in bold.
| Compute7 of 8 differ | db.m8g.4xlarge | db.m8i.4xlarge |
|---|---|---|
| vCPUs | 16 | 8 |
| Physical cores | 16 | 8 |
| Threads per core | 1 | 2 |
| Architecture | arm64 | x86_64 |
| Processor | AWS Graviton4 | Intel Xeon Scalable (Granite Rapids) |
| CPU maker | AWS | Intel |
| Sustained clock | 2.8 GHz | 3.9 GHz |
| Burstable | No | No |
| MemoryAll 1 match | db.m8g.4xlarge | db.m8i.4xlarge |
|---|---|---|
| Memory (GiB) | 64 | 64 |
| Networking1 of 3 differ | db.m8g.4xlarge | db.m8i.4xlarge |
|---|---|---|
| Network | Up to 15 Gigabit | Up to 15000 Megabit |
| Network baseline | 7.5 Gbps | 7.5 Gbps |
| Network peak | 15 Gbps | 15 Gbps |
| StorageAll 7 match | db.m8g.4xlarge | db.m8i.4xlarge |
|---|---|---|
| Storage | EBS Only | EBS Only |
| EBS baseline bandwidth | 5,000 Mbps | 5,000 Mbps |
| EBS max bandwidth | 10,000 Mbps | 10,000 Mbps |
| EBS baseline throughput | 625 MB/s | 625 MB/s |
| EBS max throughput | 1,250 MB/s | 1,250 MB/s |
| EBS baseline IOPS | 20,000 | 20,000 |
| EBS max IOPS | 40,000 | 40,000 |
| Instance details2 of 4 differ | db.m8g.4xlarge | db.m8i.4xlarge |
|---|---|---|
| Family | m8g | m8i |
| Category | General purpose | General purpose |
| Current generation | Yes | Yes |
| Normalization factor | 64 | – |
| Other1 of 1 differ | db.m8g.4xlarge | db.m8i.4xlarge |
|---|---|---|
| Hardware Basis | m8g.4xlarge | m8i.4xlarge |
On-demand prices by region
Cheapest for db.m8g.4xlarge first. PostgreSQL, USD per hour.
| Region | db.m8g.4xlarge | db.m8i.4xlarge | Difference |
|---|---|---|---|
| US East (N. Virginia)Used in summaryus-east-1 | $1.344 | $1.50 | ▲ 12% |
| US East (Ohio)us-east-2 | $1.344 | $1.50 | ▲ 12% |
| US West (Oregon)us-west-2 | $1.344 | $1.50 | ▲ 12% |
| EU (Ireland)eu-west-1 | $1.488 | $1.655 | ▲ 11% |
| Europe (Spain)eu-south-2 | $1.488 | $1.65 | ▲ 11% |
| Canada West (Calgary)ca-west-1 | $1.489 | $1.65 | ▲ 11% |
| US West (N. California)us-west-1 | $1.536 | $1.71 | ▲ 11% |
| EU (London)eu-west-2 | $1.56 | $1.73 | ▲ 11% |
| EU (Paris)eu-west-3 | $1.56 | $1.73 | ▲ 11% |
| Asia Pacific (Malaysia)ap-southeast-5 | $1.592 | $1.85 | ▲ 16% |
| EU (Frankfurt)eu-central-1 | $1.60 | $1.78 | ▲ 11% |
| Africa (Cape Town)af-south-1 | $1.774 | $1.98 | ▲ 12% |
| Asia Pacific (Tokyo)ap-northeast-1 | $1.872 | $2.07 | ▲ 11% |
| Asia Pacific (Singapore)ap-southeast-1 | $1.874 | $2.07 | ▲ 10% |
| Asia Pacific (Sydney)ap-southeast-2 | $1.874 | $2.07 | ▲ 10% |
| Asia Pacific (Seoul)ap-northeast-2 | $1.875 | $2.07 | ▲ 10% |
| Asia Pacific (Mumbai)ap-south-1 | $1.916 | $2.13 | ▲ 11% |
| Asia Pacific (Hyderabad)ap-south-2 | $1.92 | $2.13 | ▲ 11% |
| South America (Sao Paulo)sa-east-1 | $2.137 | $1.96 | ▼ 8% |
Keep exploring
Each type’s own page, and how it compares with others.
db.m8g.4xlarge
db.m8g.4xlarge prices and specsEvery size in the m8g familyCompare db.m8g.4xlarge with
db.m8i.4xlarge
db.m8i.4xlarge prices and specsEvery size in the m8i familyCompare db.m8i.4xlarge with
AWS RDS PostgreSQL prices in USD. Monthly figures use 730 hours. Prices last updated 12 Nov 2026.