db.m8g.4xlargevsdb.r8g.4xlarge

db.m8g.4xlarge is 30% cheaper than db.r8g.4xlarge on demand in US East (N. Virginia), saving $414.64 a month.

At a glancedb.m8g.4xlargedb.r8g.4xlarge
On-demand$1.344/hr30% less$1.912/hr
Lowest rate$0.6316/hr30% less3-yr reserved, no upfront$0.8986/hr3-yr reserved, no upfront
Size16 vCPUs, 64 GiB16 vCPUs, 128 GiB
ProcessorAWS Graviton4AWS Graviton4
Architecturearm64arm64

Prices in US East (N. Virginia)

“Off” is the discount against each type’s own on-demand price. PostgreSQL, USD per hour.

Optiondb.m8g.4xlargedb.r8g.4xlargedb.r8g.4xlarge vs db.m8g.4xlarge
On-demandPay by the hour$1.344$1.912▲ 42%
1-yr reservedNo upfront33% off$0.933% off$1.281▲ 42%
3-yr reservedNo upfront53% off$0.631653% off$0.8986▲ 42%
1-yr savings planHourly commitment20% off$1.07520% off$1.53▲ 42%

Key differences

The biggest lead each one has.

Where db.m8g.4xlarge leads
On-demand price$1.344 vs $1.912 per hour
30% cheaper
Where db.r8g.4xlarge leads
Memory (GiB)128 vs 64
2× higher

Specs

6 of 24 specs differ. Those are in bold.

ComputeAll 8 matchdb.m8g.4xlargedb.r8g.4xlarge
vCPUs1616
Physical cores1616
Threads per core11
Architecturearm64arm64
ProcessorAWS Graviton4AWS Graviton4
CPU makerAWSAWS
Sustained clock2.8 GHz2.8 GHz
BurstableNoNo
Memory1 of 1 differdb.m8g.4xlargedb.r8g.4xlarge
Memory (GiB)64128
NetworkingAll 3 matchdb.m8g.4xlargedb.r8g.4xlarge
NetworkUp to 15 GigabitUp to 15 Gigabit
Network baseline7.5 Gbps7.5 Gbps
Network peak15 Gbps15 Gbps
Storage1 of 7 differdb.m8g.4xlargedb.r8g.4xlarge
StorageEBS OnlyAurora IO Optimization Mode
EBS baseline bandwidth5,000 Mbps5,000 Mbps
EBS max bandwidth10,000 Mbps10,000 Mbps
EBS baseline throughput625 MB/s625 MB/s
EBS max throughput1,250 MB/s1,250 MB/s
EBS baseline IOPS20,00020,000
EBS max IOPS40,00040,000
Instance details3 of 4 differdb.m8g.4xlargedb.r8g.4xlarge
Familym8gr8g
CategoryGeneral purposeMemory optimized
Current generationYesYes
Normalization factor6441.6
Other1 of 1 differdb.m8g.4xlargedb.r8g.4xlarge
Hardware Basism8g.4xlarger8g.4xlarge

On-demand prices by region

Cheapest for db.m8g.4xlarge first. PostgreSQL, USD per hour.

Regiondb.m8g.4xlargedb.r8g.4xlargeDifference
US East (N. Virginia)Used in summaryus-east-1$1.344$1.912▲ 42%
US East (Ohio)us-east-2$1.344$1.912▲ 42%
US West (Oregon)us-west-2$1.344$1.912▲ 42%
EU (Stockholm)eu-north-1$1.416$1.96▲ 38%
EU (Ireland)eu-west-1$1.488$2.144▲ 44%
Europe (Spain)eu-south-2$1.488$2.144▲ 44%
US West (N. California)us-west-1$1.536$2.144▲ 40%
EU (London)eu-west-2$1.56$2.244▲ 44%
EU (Paris)eu-west-3$1.56$2.243▲ 44%
Asia Pacific (Malaysia)ap-southeast-5$1.592$1.952▲ 23%
EU (Frankfurt)eu-central-1$1.60$2.328▲ 45%
Europe (Zurich)eu-central-2$1.768$2.56▲ 45%
Asia Pacific (Tokyo)ap-northeast-1$1.872$2.296▲ 23%
Asia Pacific (Singapore)ap-southeast-1$1.874$2.296▲ 23%
Asia Pacific (Sydney)ap-southeast-2$1.874$2.296▲ 23%
Asia Pacific (Seoul)ap-northeast-2$1.875$2.295▲ 22%
Asia Pacific (Mumbai)ap-south-1$1.916$2.176▲ 14%
Asia Pacific (Hyderabad)ap-south-2$1.92$2.176▲ 13%
Asia Pacific (Hong Kong)ap-east-1$2.064$2.525▲ 22%
South America (Sao Paulo)sa-east-1$2.137$3.04▲ 42%

Keep exploring

Each type’s own page, and how it compares with others.

db.m8g.4xlargeGeneral purpose, m8g family
db.m8g.4xlarge prices and specsEvery size in the m8g family

Compare db.m8g.4xlarge with

db.m8i.4xlargedb.m8a.4xlargedb.m8gd.4xlargedb.m7g.4xlargedb.m9g.4xlarge
db.r8g.4xlargeMemory optimized, r8g family
db.r8g.4xlarge prices and specsEvery size in the r8g family

Compare db.r8g.4xlarge with

db.r8gd.4xlargedb.r8i.4xlargedb.r8a.4xlargedb.r7g.4xlarge

Pay the committed rate, with commitment protection

The best committed rate on these two is 53% below on-demand. Connect your cloud accounts to unlock greater savings with commitment protection.

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AWS RDS PostgreSQL prices in USD. Monthly figures use 730 hours. Prices last updated 12 Nov 2026.