db.r4.8xlargevsdb.r5.8xlarge

db.r4.8xlarge and db.r5.8xlarge cost the same on demand in US East (N. Virginia), $4.00 per hour.

At a glancedb.r4.8xlargedb.r5.8xlarge
On-demand$4.00/hr$4.00/hr
Size32 vCPUs, 244 GiB32 vCPUs, 256 GiB
ProcessorIntel Xeon E5-2686 v4 (Broadwell)Intel Xeon Platinum 8175
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.r4.8xlargedb.r5.8xlargedb.r5.8xlarge vs db.r4.8xlarge
On-demandPay by the hour$4.00$4.00Same
1-yr reservedNo upfront—42% off$2.31—

Key differences

The biggest lead each one has.

Where db.r4.8xlarge leads
EBS baseline IOPS37,500 vs 30,000
25% higher
Network baseline12 Gbps vs 10 Gbps
20% higher
Where db.r5.8xlarge leads
Clock speedUp to 3.1 GHz vs 2.3 GHz
35% higher
Memory (GiB)256 vs 244
5% higher

Specs

18 of 27 specs differ. Those are in bold.

Compute4 of 10 differdb.r4.8xlargedb.r5.8xlarge
vCPUs3232
Physical cores1616
Threads per core22
Architecturex86_64x86_64
ProcessorIntel Xeon E5-2686 v4 (Broadwell)Intel Xeon Platinum 8175
CPU makerIntelIntel
Clock speed2.3 GHzUp to 3.1 GHz
Sustained clock2.3 GHz3.1 GHz
Processor featuresIntel AVX, Intel AVX2, Intel Turbo–
BurstableNoNo
Memory1 of 1 differdb.r4.8xlargedb.r5.8xlarge
Memory (GiB)244256
Networking2 of 3 differdb.r4.8xlargedb.r5.8xlarge
Network10 Gigabit10 Gigabit
Network baseline12 Gbps10 Gbps
Network peak12 Gbps10 Gbps
Storage7 of 8 differdb.r4.8xlargedb.r5.8xlarge
StorageEBS OnlyEBS Only
EBS throughput6000 Mbps–
EBS baseline bandwidth7,000 Mbps6,800 Mbps
EBS max bandwidth7,000 Mbps6,800 Mbps
EBS baseline throughput875 MB/s850 MB/s
EBS max throughput875 MB/s850 MB/s
EBS baseline IOPS37,50030,000
EBS max IOPS37,50030,000
Instance details3 of 4 differdb.r4.8xlargedb.r5.8xlarge
Familyr4r5
CategoryMemory optimizedMemory optimized
Current generationNoYes
Normalization factor128–
Other1 of 1 differdb.r4.8xlargedb.r5.8xlarge
Hardware Basisr4.8xlarger5.8xlarge

On-demand prices by region

Cheapest for db.r4.8xlarge first. PostgreSQL, USD per hour.

Regiondb.r4.8xlargedb.r5.8xlargeDifference
US East (N. Virginia)Used in summaryus-east-1$4.00$4.00Same
US East (Ohio)us-east-2$4.00$4.00Same
US West (Oregon)us-west-2$4.00$4.00Same
Canada (Central)ca-central-1$4.324$4.324Same
EU (Ireland)eu-west-1$4.48$4.48Same
US West (N. California)us-west-1$4.48$4.48Same
Asia Pacific (Mumbai)ap-south-1$4.56$4.56Same
EU (London)eu-west-2$4.704$4.704Same
EU (Paris)eu-west-3$4.704$4.704Same
Asia Pacific (Osaka)ap-northeast-3$4.80$4.80Same
Asia Pacific (Seoul)ap-northeast-2$4.80$4.80Same
Asia Pacific (Singapore)ap-southeast-1$4.80$4.80Same
Asia Pacific (Sydney)ap-southeast-2$4.80$4.80Same
Asia Pacific (Tokyo)ap-northeast-1$4.80$4.80Same
AWS GovCloud (US-East)us-gov-east-1$4.816$4.82Same
AWS GovCloud (US-West)us-gov-west-1$4.816$4.82Same
EU (Frankfurt)eu-central-1$4.88$4.88Same
South America (Sao Paulo)sa-east-1$8.376$8.376Same

Keep exploring

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

db.r4.8xlargeMemory optimized, r4 family
db.r4.8xlarge prices and specsEvery size in the r4 family

Compare db.r4.8xlarge with

db.r3.8xlargedb.r5.8xlarge.tpc2.mem3x
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.8xlargedb.r5b.8xlarge.tpc2.mem3xdb.r6i.8xlargedb.r6i.8xlarge.tpc2.mem3xdb.r6i.8xlarge.tpc2.mem4x

Pay the committed rate, with commitment protection

The best committed rate on these two is 0–42% 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.