db.r5.16xlargevsdb.r5b.16xlarge

db.r5.16xlarge is 16% cheaper than db.r5b.16xlarge on demand in US East (N. Virginia), saving $1,074.56 a month.

At a glancedb.r5.16xlargedb.r5b.16xlarge
On-demand$8.00/hr16% less$9.472/hr
Lowest rate$4.62/hr16% less1-yr reserved, no upfront$5.486/hr1-yr reserved, no upfront
Size64 vCPUs, 512 GiB64 vCPUs, 512 GiB
ProcessorIntel Xeon Platinum 8175Intel Xeon Platinum 8000 series
Architecturex86_64x86_64

Prices in US East (N. Virginia)

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

Optiondb.r5.16xlargedb.r5b.16xlargedb.r5b.16xlarge vs db.r5.16xlarge
On-demandPay by the hour$8.00$9.472▲ 18%
1-yr reservedNo upfront42% off$4.6242% off$5.486▲ 19%

Key differences

The biggest lead each one has.

Where db.r5.16xlarge leads
On-demand price$8.00 vs $9.472 per hour
16% cheaper
Where db.r5b.16xlarge leads
EBS baseline bandwidth40,000 Mbps vs 13,600 Mbps
2.9× higher

Specs

11 of 26 specs differ. Those are in bold.

Compute1 of 9 differdb.r5.16xlargedb.r5b.16xlarge
vCPUs6464
Physical cores3232
Threads per core22
Architecturex86_64x86_64
ProcessorIntel Xeon Platinum 8175Intel Xeon Platinum 8000 series
CPU makerIntelIntel
Clock speedUp to 3.1 GHzUp to 3.1 GHz
Sustained clock3.1 GHz3.1 GHz
BurstableNoNo
MemoryAll 1 matchdb.r5.16xlargedb.r5b.16xlarge
Memory (GiB)512512
NetworkingAll 3 matchdb.r5.16xlargedb.r5b.16xlarge
Network20 Gigabit20 Gigabit
Network baseline20 Gbps20 Gbps
Network peak20 Gbps20 Gbps
Storage7 of 8 differdb.r5.16xlargedb.r5b.16xlarge
StorageEBS OnlyEBS Only
EBS throughput–5000 Mbps
EBS baseline bandwidth13,600 Mbps40,000 Mbps
EBS max bandwidth13,600 Mbps40,000 Mbps
EBS baseline throughput1,700 MB/s5,000 MB/s
EBS max throughput1,700 MB/s5,000 MB/s
EBS baseline IOPS60,000173,333
EBS max IOPS60,000173,333
Instance details2 of 4 differdb.r5.16xlargedb.r5b.16xlarge
Familyr5r5b
CategoryMemory optimizedMemory optimized
Current generationYesYes
Normalization factor128256
Other1 of 1 differdb.r5.16xlargedb.r5b.16xlarge
Hardware Basisr5.16xlarger5b.16xlarge

On-demand prices by region

Cheapest for db.r5.16xlarge first. PostgreSQL, USD per hour.

Regiondb.r5.16xlargedb.r5b.16xlargeDifference
US East (N. Virginia)Used in summaryus-east-1$8.00$9.472▲ 18%
US East (Ohio)us-east-2$8.00$9.472▲ 18%
US West (Oregon)us-west-2$8.00$9.472▲ 18%
EU (Stockholm)eu-north-1$8.228$9.35▲ 14%
Canada (Central)ca-central-1$8.648$9.65▲ 12%
EU (Ireland)eu-west-1$8.96$9.886▲ 10%
EU (London)eu-west-2$9.408$10.36▲ 10%
EU (Milan)eu-south-1$9.408$10.36▲ 10%
Asia Pacific (Seoul)ap-northeast-2$9.60$10.538▲ 10%
Asia Pacific (Singapore)ap-southeast-1$9.60$11.232▲ 17%
Asia Pacific (Sydney)ap-southeast-2$9.60$10.715▲ 12%
Asia Pacific (Tokyo)ap-northeast-1$9.60$11.424▲ 19%
EU (Frankfurt)eu-central-1$9.76$11.43▲ 17%
South America (Sao Paulo)sa-east-1$16.752$14.03▼ 16%

Keep exploring

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

db.r5.16xlargeMemory optimized, r5 family
db.r5.16xlarge prices and specsEvery size in the r5 family

Compare db.r5.16xlarge with

db.m5.16xlargedb.r5d.16xlargedb.r4.16xlargedb.r6i.16xlarge
db.r5b.16xlargeMemory optimized, r5b family
db.r5b.16xlarge prices and specsEvery size in the r5b family

Pay the committed rate, with commitment protection

The best committed rate on these two is 42% below on-demand. Connect your cloud accounts to unlock greater savings with commitment protection.

Connect AWS account

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