db.r5.4xlargevsdb.r5b.4xlarge.tpc2.mem4x

db.r5.4xlarge is 77% cheaper than db.r5b.4xlarge.tpc2.mem4x on demand in US East (N. Virginia), saving $4,979.33 a month.

At a glancedb.r5.4xlargedb.r5b.4xlarge.tpc2.mem4x
On-demand$2.00/hr77% less$8.821/hr
Size16 vCPUs, 128 GiB16 vCPUs, 512 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.4xlarge.tpc2.mem4xdb.r5b.4xlarge.tpc2.mem4x vs db.r5.4xlarge
On-demandPay by the hour$2.00$8.821▲ 341%
1-yr reservedNo upfront42% off$1.155——

Key differences

The biggest lead each one has.

Where db.r5.4xlarge leads
On-demand price$2.00 vs $8.821 per hour
77% cheaper
Where db.r5b.4xlarge.tpc2.mem4x leads
Memory (GiB)512 vs 128
4× higher

Specs

22 of 25 specs differ. Those are in bold.

Compute8 of 9 differdb.r5.4xlargedb.r5b.4xlarge.tpc2.mem4x
vCPUs1616
Physical cores8–
Threads per core2–
Architecture–x86_64
Processor–Intel Xeon Platinum 8000 series
CPU makerIntel–
Clock speed–Up to 3.1 GHz
Sustained clock3.1 GHz–
BurstableNo–
Memory1 of 1 differdb.r5.4xlargedb.r5b.4xlarge.tpc2.mem4x
Memory (GiB)128512
Networking3 of 3 differdb.r5.4xlargedb.r5b.4xlarge.tpc2.mem4x
Network–20 Gigabit
Network baseline5 Gbps–
Network peak10 Gbps–
Storage6 of 7 differdb.r5.4xlargedb.r5b.4xlarge.tpc2.mem4x
StorageEBS OnlyEBS Only
EBS baseline bandwidth4,750 Mbps–
EBS max bandwidth4,750 Mbps–
EBS baseline throughput593.75 MB/s–
EBS max throughput593.75 MB/s–
EBS baseline IOPS18,750–
EBS max IOPS18,750–
Instance details3 of 4 differdb.r5.4xlargedb.r5b.4xlarge.tpc2.mem4x
Familyr5r5b
CategoryMemory optimizedMemory optimized
Current generation–Yes
Normalization factor32128
Other1 of 1 differdb.r5.4xlargedb.r5b.4xlarge.tpc2.mem4x
Hardware Basisr5.4xlarge–

On-demand prices by region

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

Regiondb.r5.4xlargedb.r5b.4xlarge.tpc2.mem4xDifference
US East (N. Virginia)Used in summaryus-east-1$2.00$8.821▲ 341%
US East (Ohio)us-east-2$2.00$8.821▲ 341%
US West (Oregon)us-west-2$2.00$8.821▲ 341%
EU (Stockholm)eu-north-1$2.057$9.35▲ 355%
Canada (Central)ca-central-1$2.162$9.65▲ 346%
EU (Ireland)eu-west-1$2.24$9.886▲ 341%
EU (London)eu-west-2$2.352$10.36▲ 340%
EU (Milan)eu-south-1$2.352$10.36▲ 340%
Asia Pacific (Seoul)ap-northeast-2$2.40$10.538▲ 339%
Asia Pacific (Singapore)ap-southeast-1$2.40$10.538▲ 339%
Asia Pacific (Sydney)ap-southeast-2$2.40$10.715▲ 346%
Asia Pacific (Tokyo)ap-northeast-1$2.40$10.715▲ 346%
EU (Frankfurt)eu-central-1$2.44$10.538▲ 332%
South America (Sao Paulo)sa-east-1$4.188$14.03▲ 235%

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.4xlargedb.r5b.4xlarge.tpc2.mem2xdb.r5b.4xlarge.tpc2.mem3xdb.r4.4xlargedb.r6i.4xlargedb.r6i.4xlarge.tpc2.mem2xdb.r6i.4xlarge.tpc2.mem3xdb.r6i.4xlarge.tpc2.mem4xdb.r6i.4xlarge.tpc2.mem8x
db.r5b.4xlarge.tpc2.mem4xMemory optimized, r5b family
db.r5b.4xlarge.tpc2.mem4x prices and specsEvery size in the r5b family

Compare db.r5b.4xlarge.tpc2.mem4x 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 0–42% 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.