db.r5.8xlargevsdb.r5b.8xlarge

db.r5.8xlarge is 16% cheaper than db.r5b.8xlarge on demand in US East (N. Virginia), saving $537.28 a month.

At a glancedb.r5.8xlargedb.r5b.8xlarge
On-demand$4.00/hr16% less$4.736/hr
Lowest rate$2.31/hr16% less1-yr reserved, no upfront$2.743/hr1-yr reserved, no upfront
Size32 vCPUs, 256 GiB32 vCPUs, 256 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.r5.8xlargedb.r5b.8xlargedb.r5b.8xlarge vs db.r5.8xlarge
On-demandPay by the hour$4.00$4.736▲ 18%
1-yr reservedNo upfront42% off$2.3142% off$2.743▲ 19%

Key differences

The biggest lead each one has.

Where db.r5.8xlarge leads
On-demand price$4.00 vs $4.736 per hour
16% cheaper
Where db.r5b.8xlarge leads
EBS baseline bandwidth20,000 Mbps vs 6,800 Mbps
2.9× higher

Specs

11 of 26 specs differ. Those are in bold.

Compute1 of 9 differdb.r5.8xlargedb.r5b.8xlarge
vCPUs3232
Physical cores1616
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.r5.8xlargedb.r5b.8xlarge
Memory (GiB)256256
NetworkingAll 3 matchdb.r5.8xlargedb.r5b.8xlarge
Network10 Gigabit10 Gigabit
Network baseline10 Gbps10 Gbps
Network peak10 Gbps10 Gbps
Storage7 of 8 differdb.r5.8xlargedb.r5b.8xlarge
StorageEBS OnlyEBS Only
EBS throughput–2500 Mbps
EBS baseline bandwidth6,800 Mbps20,000 Mbps
EBS max bandwidth6,800 Mbps20,000 Mbps
EBS baseline throughput850 MB/s2,500 MB/s
EBS max throughput850 MB/s2,500 MB/s
EBS baseline IOPS30,00086,667
EBS max IOPS30,00086,667
Instance details2 of 4 differdb.r5.8xlargedb.r5b.8xlarge
Familyr5r5b
CategoryMemory optimizedMemory optimized
Current generationYesYes
Normalization factor–128
Other1 of 1 differdb.r5.8xlargedb.r5b.8xlarge
Hardware Basisr5.8xlarger5b.8xlarge

On-demand prices by region

Cheapest for db.r5.8xlarge first. PostgreSQL, USD per hour.

Regiondb.r5.8xlargedb.r5b.8xlargeDifference
US East (N. Virginia)Used in summaryus-east-1$4.00$4.736▲ 18%
US East (Ohio)us-east-2$4.00$4.736▲ 18%
US West (Oregon)us-west-2$4.00$4.736▲ 18%
EU (Stockholm)eu-north-1$4.114$4.675▲ 14%
Canada (Central)ca-central-1$4.324$4.825▲ 12%
EU (Ireland)eu-west-1$4.48$4.943▲ 10%
EU (London)eu-west-2$4.704$5.18▲ 10%
EU (Milan)eu-south-1$4.704$5.18▲ 10%
Asia Pacific (Seoul)ap-northeast-2$4.80$5.269▲ 10%
Asia Pacific (Singapore)ap-southeast-1$4.80$5.616▲ 17%
Asia Pacific (Sydney)ap-southeast-2$4.80$5.358▲ 12%
Asia Pacific (Tokyo)ap-northeast-1$4.80$5.712▲ 19%
EU (Frankfurt)eu-central-1$4.88$5.715▲ 17%
South America (Sao Paulo)sa-east-1$8.376$7.015▼ 16%

Keep exploring

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

db.r5.8xlargeMemory optimized, r5 family
db.r5.8xlarge prices and specsEvery size in the r5 family

Compare db.r5.8xlarge with

db.m5.8xlargedb.r5d.8xlargedb.r5b.8xlarge.tpc2.mem3xdb.r4.8xlargedb.r6i.8xlargedb.r6i.8xlarge.tpc2.mem3xdb.r6i.8xlarge.tpc2.mem4x
db.r5b.8xlargeMemory optimized, r5b family
db.r5b.8xlarge prices and specsEvery size in the r5b family

Compare db.r5b.8xlarge with

db.r5.8xlarge.tpc2.mem3x

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.

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