db.r8g.4xlargevsdb.r8i.4xlarge

db.r8g.4xlarge is 9% cheaper than db.r8i.4xlarge on demand in US East (N. Virginia), saving $137.24 a month.

At a glancedb.r8g.4xlargedb.r8i.4xlarge
On-demand$1.912/hr9% less$2.10/hr
Lowest rate$0.8986/hr9% less3-yr reserved, no upfront$0.987/hr3-yr reserved, no upfront
Size16 vCPUs, 128 GiB16 vCPUs, 128 GiB

Prices in US East (N. Virginia)

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

Optiondb.r8g.4xlargedb.r8i.4xlargedb.r8i.4xlarge vs db.r8g.4xlarge
On-demandPay by the hour$1.912$2.10▲ 10%
1-yr reservedNo upfront33% off$1.28133% off$1.407▲ 10%
3-yr reservedNo upfront53% off$0.898653% off$0.987▲ 10%
1-yr savings planHourly commitment20% off$1.5320% off$1.68▲ 10%

Key differences

The biggest lead each one has.

Where db.r8g.4xlarge leads
On-demand price$1.912 vs $2.10 per hour
9% cheaper
Physical cores16 vs 8
2× higher
Where db.r8i.4xlarge leads
Sustained clock3.9 GHz vs 2.8 GHz
39% higher

Specs

13 of 24 specs differ. Those are in bold.

Compute6 of 8 differdb.r8g.4xlargedb.r8i.4xlarge
vCPUs1616
Physical cores168
Threads per core12
Architecturearm64–
ProcessorAWS Graviton4–
CPU makerAWSIntel
Sustained clock2.8 GHz3.9 GHz
BurstableNoNo
MemoryAll 1 matchdb.r8g.4xlargedb.r8i.4xlarge
Memory (GiB)128128
Networking1 of 3 differdb.r8g.4xlargedb.r8i.4xlarge
NetworkUp to 15 Gigabit–
Network baseline7.5 Gbps7.5 Gbps
Network peak15 Gbps15 Gbps
Storage1 of 7 differdb.r8g.4xlargedb.r8i.4xlarge
StorageAurora 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 details4 of 4 differdb.r8g.4xlargedb.r8i.4xlarge
Familyr8gr8i
CategoryMemory optimized–
Current generationYes–
Normalization factor41.632
Other1 of 1 differdb.r8g.4xlargedb.r8i.4xlarge
Hardware Basisr8g.4xlarger8i.4xlarge

On-demand prices by region

Cheapest for db.r8g.4xlarge first. PostgreSQL, USD per hour.

Regiondb.r8g.4xlargedb.r8i.4xlargeDifference
US East (N. Virginia)Used in summaryus-east-1$1.912$2.10▲ 10%
US East (Ohio)us-east-2$1.912$2.10▲ 10%
US West (Oregon)us-west-2$1.912$2.10▲ 10%
Asia Pacific (Malaysia)ap-southeast-5$1.952$2.14▲ 10%
EU (Stockholm)eu-north-1$1.96$2.159▲ 10%
Canada (Central)ca-central-1$2.066$2.27▲ 10%
EU (Ireland)eu-west-1$2.144$2.35▲ 10%
Europe (Spain)eu-south-2$2.144$2.35▲ 10%
US West (N. California)us-west-1$2.144$2.35▲ 10%
Asia Pacific (Hyderabad)ap-south-2$2.176$2.39▲ 10%
Asia Pacific (Mumbai)ap-south-1$2.176$2.39▲ 10%
EU (Paris)eu-west-3$2.243$2.47▲ 10%
EU (London)eu-west-2$2.244$2.47▲ 10%
Asia Pacific (Seoul)ap-northeast-2$2.295$2.52▲ 10%
Asia Pacific (Singapore)ap-southeast-1$2.296$2.52▲ 10%
Asia Pacific (Sydney)ap-southeast-2$2.296$2.52▲ 10%
Asia Pacific (Tokyo)ap-northeast-1$2.296$2.52▲ 10%
EU (Frankfurt)eu-central-1$2.328$2.56▲ 10%
Europe (Zurich)eu-central-2$2.56$2.734▲ 7%
South America (Sao Paulo)sa-east-1$3.04$3.307▲ 9%

Keep exploring

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

db.r8g.4xlargeMemory optimized, r8g family
db.r8g.4xlarge prices and specsEvery size in the r8g family

Compare db.r8g.4xlarge with

db.m8g.4xlargedb.r8gd.4xlargedb.r8a.4xlargedb.r7g.4xlarge
db.r8i.4xlarger8i family
db.r8i.4xlarge prices and specsEvery size in the r8i family

Compare db.r8i.4xlarge with

db.m8i.4xlargedb.r8a.4xlargedb.r7i.4xlargedb.r7i.4xlarge.tpc2.mem2xdb.r7i.4xlarge.tpc2.mem3xdb.r7i.4xlarge.tpc2.mem4x

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.