db.r5.4xlargevsdb.r5b.4xlarge

db.r5.4xlarge is 16% cheaper than db.r5b.4xlarge on demand in US East (N. Virginia), saving $268.64 a month.

At a glancedb.r5.4xlargedb.r5b.4xlarge
On-demand$2.00/hr16% less$2.368/hr
Lowest rate$1.155/hr16% less1-yr reserved, no upfront$1.372/hr1-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.r5.4xlargedb.r5b.4xlargedb.r5b.4xlarge vs db.r5.4xlarge
On-demandPay by the hour$2.00$2.368▲ 18%
1-yr reservedNo upfront42% off$1.15542% off$1.372▲ 19%

Key differences

The biggest lead each one has.

Where db.r5.4xlarge leads
On-demand price$2.00 vs $2.368 per hour
16% cheaper
Where db.r5b.4xlarge leads
EBS baseline IOPS43,333 vs 18,750
2.3× higher

Specs

15 of 26 specs differ. Those are in bold.

Compute3 of 9 differdb.r5.4xlargedb.r5b.4xlarge
vCPUs1616
Physical cores88
Threads per core22
Architecture–x86_64
Processor–Intel Xeon Platinum 8000 series
CPU makerIntelIntel
Clock speed–Up to 3.1 GHz
Sustained clock3.1 GHz3.1 GHz
BurstableNoNo
MemoryAll 1 matchdb.r5.4xlargedb.r5b.4xlarge
Memory (GiB)128128
Networking1 of 3 differdb.r5.4xlargedb.r5b.4xlarge
Network–Up to 10 Gigabit
Network baseline5 Gbps5 Gbps
Network peak10 Gbps10 Gbps
Storage7 of 8 differdb.r5.4xlargedb.r5b.4xlarge
StorageEBS OnlyEBS Only
EBS throughput–1250 Mbps
EBS baseline bandwidth4,750 Mbps10,000 Mbps
EBS max bandwidth4,750 Mbps10,000 Mbps
EBS baseline throughput593.75 MB/s1,250 MB/s
EBS max throughput593.75 MB/s1,250 MB/s
EBS baseline IOPS18,75043,333
EBS max IOPS18,75043,333
Instance details3 of 4 differdb.r5.4xlargedb.r5b.4xlarge
Familyr5r5b
CategoryMemory optimizedMemory optimized
Current generation–Yes
Normalization factor3264
Other1 of 1 differdb.r5.4xlargedb.r5b.4xlarge
Hardware Basisr5.4xlarger5b.4xlarge

On-demand prices by region

Cheapest for db.r5.4xlarge first. PostgreSQL, USD per hour.

Regiondb.r5.4xlargedb.r5b.4xlargeDifference
US East (N. Virginia)Used in summaryus-east-1$2.00$2.368▲ 18%
US East (Ohio)us-east-2$2.00$2.368▲ 18%
US West (Oregon)us-west-2$2.00$2.368▲ 18%
EU (Stockholm)eu-north-1$2.057$2.338▲ 14%
Canada (Central)ca-central-1$2.162$2.412▲ 12%
EU (Ireland)eu-west-1$2.24$2.472▲ 10%
EU (London)eu-west-2$2.352$2.59▲ 10%
EU (Milan)eu-south-1$2.352$2.59▲ 10%
Asia Pacific (Seoul)ap-northeast-2$2.40$2.634▲ 10%
Asia Pacific (Singapore)ap-southeast-1$2.40$2.808▲ 17%
Asia Pacific (Sydney)ap-southeast-2$2.40$2.679▲ 12%
Asia Pacific (Tokyo)ap-northeast-1$2.40$2.856▲ 19%
EU (Frankfurt)eu-central-1$2.44$2.858▲ 17%
South America (Sao Paulo)sa-east-1$4.188$3.508▼ 16%

Keep exploring

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

db.r5.4xlargeMemory optimized, r5 family
db.r5.4xlarge prices and specsEvery size in the r5 family

Compare db.r5.4xlarge with

db.m5.4xlargedb.r5d.4xlargedb.r5b.4xlarge.tpc2.mem2xdb.r5b.4xlarge.tpc2.mem3xdb.r5b.4xlarge.tpc2.mem4xdb.r4.4xlargedb.r6i.4xlargedb.r6i.4xlarge.tpc2.mem2xdb.r6i.4xlarge.tpc2.mem3xdb.r6i.4xlarge.tpc2.mem4xdb.r6i.4xlarge.tpc2.mem8x
db.r5b.4xlargeMemory optimized, r5b family
db.r5b.4xlarge prices and specsEvery size in the r5b family

Compare db.r5b.4xlarge with

db.r5.4xlarge.tpc2.mem2xdb.r5.4xlarge.tpc2.mem3xdb.r5.4xlarge.tpc2.mem4x

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The best committed rate on these two is 42% 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.