db.t4g.xlargevsdb.m9g.xlarge

db.t4g.xlarge is 30% cheaper than db.m9g.xlarge on demand in US East (N. Virginia), saving $78.84 a month.

At a glancedb.t4g.xlargedb.m9g.xlarge
On-demand$0.258/hr30% less$0.366/hr
Size4 vCPUs, 16 GiB4 vCPUs, 16 GiB
Architecturearm64arm64
CPUBurstableBest for workloads that are mostly idleFull CPUSteady performance, no credits to manage

Prices in US East (N. Virginia)

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

Optiondb.t4g.xlargedb.m9g.xlargedb.m9g.xlarge vs db.t4g.xlarge
On-demandPay by the hour$0.258$0.366▲ 42%
1-yr reservedNo upfront28% off$0.186——
1-yr savings planHourly commitment—20% off$0.2928—

Key differences

The biggest lead each one has.

Where db.t4g.xlarge leads
On-demand price$0.258 vs $0.366 per hour
30% cheaper
CPU modelEarns credits while idle, then bursts
Burstable
Where db.m9g.xlarge leads
CPU modelSteady performance, no credits to manage
Full CPU
EBS max bandwidth12,000 Mbps vs 2,780 Mbps
4.3× higher
Network peak15 Gbps vs 5 Gbps
3× higher
Sustained clock3.3 GHz vs 2.5 GHz
32% higher

Specs

18 of 24 specs differ. Those are in bold.

Compute3 of 8 differdb.t4g.xlargedb.m9g.xlarge
vCPUs44
Physical cores44
Threads per core11
Architecturearm64arm64
ProcessorAWS Graviton2–
CPU makerAWSAWS
Sustained clock2.5 GHz3.3 GHz
BurstableYesNo
MemoryAll 1 matchdb.t4g.xlargedb.m9g.xlarge
Memory (GiB)1616
Networking3 of 3 differdb.t4g.xlargedb.m9g.xlarge
NetworkUp to 5 Gigabit–
Network baseline1.024 Gbps2.1 Gbps
Network peak5 Gbps15 Gbps
Storage7 of 7 differdb.t4g.xlargedb.m9g.xlarge
StorageEBS Only–
EBS baseline bandwidth695 Mbps1,500 Mbps
EBS max bandwidth2,780 Mbps12,000 Mbps
EBS baseline throughput86.875 MB/s187.5 MB/s
EBS max throughput347.5 MB/s1,500 MB/s
EBS baseline IOPS4,0006,000
EBS max IOPS15,70048,000
Instance details4 of 4 differdb.t4g.xlargedb.m9g.xlarge
Familyt4gm9g
CategoryGeneral purpose–
Current generationYes–
Normalization factor168
Other1 of 1 differdb.t4g.xlargedb.m9g.xlarge
Hardware Basist4g.xlargem9g.xlarge

On-demand prices by region

Cheapest for db.t4g.xlarge first. PostgreSQL, USD per hour.

Regiondb.t4g.xlargedb.m9g.xlargeDifference
US East (N. Virginia)Used in summaryus-east-1$0.258$0.366▲ 42%
US East (Ohio)us-east-2$0.258$0.366▲ 42%
US West (Oregon)us-west-2$0.258$0.366▲ 42%
EU (Frankfurt)eu-central-1$0.298$0.436▲ 46%

Keep exploring

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

db.t4g.xlargeGeneral purpose, t4g family, burstable
db.t4g.xlarge prices and specsEvery size in the t4g family

Compare db.t4g.xlarge with

db.m6g.xlargedb.m8g.xlargedb.m6gd.xlargedb.m7g.xlargedb.m8gd.xlarge
db.m9g.xlargem9g family
db.m9g.xlarge prices and specsEvery size in the m9g family

Compare db.m9g.xlarge with

db.m8g.xlarge

Pay the committed rate, with commitment protection

The best committed rate on these two is 20–28% 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.