db.r8g.16xlargevsdb.r8i.16xlarge

db.r8g.16xlarge is 9% cheaper than db.r8i.16xlarge on demand in US East (N. Virginia), saving $548.96 a month. Per vCPU, db.r8g.16xlarge costs 54% 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 glancedb.r8g.16xlargedb.r8i.16xlarge
On-demand$7.648/hr9% less$8.40/hr
Lowest rate$3.595/hr9% less3-yr reserved, no upfront$3.948/hr3-yr reserved, no upfront
Size64 vCPUs, 512 GiB32 vCPUs, 512 GiB
ProcessorAWS Graviton4Intel Xeon Scalable (Granite Rapids)
Architecturearm64x86_64

Prices in US East (N. Virginia)

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

Optiondb.r8g.16xlargedb.r8i.16xlargedb.r8i.16xlarge vs db.r8g.16xlarge
On-demandPay by the hour$7.648$8.40▲ 10%
1-yr reservedNo upfront33% off$5.12433% off$5.628▲ 10%
3-yr reservedNo upfront53% off$3.59553% off$3.948▲ 10%
1-yr savings planHourly commitment20% off$6.11820% off$6.72▲ 10%

Key differences

The biggest lead each one has.

Where db.r8g.16xlarge leads
On-demand price$7.648 vs $8.40 per hour
9% cheaper
vCPUs64 vs 32
2× higher
Where db.r8i.16xlarge leads
Sustained clock3.9 GHz vs 2.8 GHz
39% higher

Specs

11 of 24 specs differ. Those are in bold.

Compute7 of 8 differdb.r8g.16xlargedb.r8i.16xlarge
vCPUs6432
Physical cores6432
Threads per core12
Architecturearm64x86_64
ProcessorAWS Graviton4Intel Xeon Scalable (Granite Rapids)
CPU makerAWSIntel
Sustained clock2.8 GHz3.9 GHz
BurstableNoNo
MemoryAll 1 matchdb.r8g.16xlargedb.r8i.16xlarge
Memory (GiB)512512
Networking1 of 3 differdb.r8g.16xlargedb.r8i.16xlarge
Network30 Gigabit30000 Megabit
Network baseline30 Gbps30 Gbps
Network peak30 Gbps30 Gbps
StorageAll 7 matchdb.r8g.16xlargedb.r8i.16xlarge
StorageEBS OnlyEBS Only
EBS baseline bandwidth20,000 Mbps20,000 Mbps
EBS max bandwidth20,000 Mbps20,000 Mbps
EBS baseline throughput2,500 MB/s2,500 MB/s
EBS max throughput2,500 MB/s2,500 MB/s
EBS baseline IOPS80,00080,000
EBS max IOPS80,00080,000
Instance details2 of 4 differdb.r8g.16xlargedb.r8i.16xlarge
Familyr8gr8i
CategoryMemory optimizedMemory optimized
Current generationYesYes
Normalization factor128–
Other1 of 1 differdb.r8g.16xlargedb.r8i.16xlarge
Hardware Basisr8g.16xlarger8i.16xlarge

On-demand prices by region

Cheapest for db.r8g.16xlarge first. PostgreSQL, USD per hour.

Regiondb.r8g.16xlargedb.r8i.16xlargeDifference
US East (N. Virginia)Used in summaryus-east-1$7.648$8.40▲ 10%
US East (Ohio)us-east-2$7.648$8.40▲ 10%
US West (Oregon)us-west-2$7.648$8.40▲ 10%
Asia Pacific (Malaysia)ap-southeast-5$7.808$8.57▲ 10%
EU (Stockholm)eu-north-1$7.84$8.635▲ 10%
Canada (Central)ca-central-1$8.262$9.07▲ 10%
EU (Ireland)eu-west-1$8.576$9.41▲ 10%
Europe (Spain)eu-south-2$8.576$9.41▲ 10%
US West (N. California)us-west-1$8.576$9.41▲ 10%
Asia Pacific (Hyderabad)ap-south-2$8.704$9.58▲ 10%
Asia Pacific (Mumbai)ap-south-1$8.704$9.58▲ 10%
EU (Paris)eu-west-3$8.974$9.88▲ 10%
EU (London)eu-west-2$8.976$9.88▲ 10%
Asia Pacific (Seoul)ap-northeast-2$9.181$10.08▲ 10%
Asia Pacific (Singapore)ap-southeast-1$9.184$10.08▲ 10%
Asia Pacific (Sydney)ap-southeast-2$9.184$10.08▲ 10%
Asia Pacific (Tokyo)ap-northeast-1$9.184$10.08▲ 10%
EU (Frankfurt)eu-central-1$9.312$10.25▲ 10%
Europe (Zurich)eu-central-2$10.24$10.937▲ 7%
South America (Sao Paulo)sa-east-1$12.16$13.229▲ 9%

Keep exploring

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

db.r8g.16xlargeMemory optimized, r8g family
db.r8g.16xlarge prices and specsEvery size in the r8g family

Compare db.r8g.16xlarge with

db.m8g.16xlargedb.r8gd.16xlargedb.r8a.16xlargedb.r7g.16xlarge
db.r8i.16xlargeMemory optimized, r8i family
db.r8i.16xlarge prices and specsEvery size in the r8i family

Compare db.r8i.16xlarge with

db.m8i.16xlargedb.r8a.16xlargedb.r7i.16xlarge

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.