db.m8a.16xlargevsdb.m8i.16xlarge

db.m8i.16xlarge is 13% cheaper than db.m8a.16xlarge on demand in US East (N. Virginia), saving $654.66 a month. Per vCPU, db.m8i.16xlarge costs 57% less.

At a glance	db.m8a.16xlarge	db.m8i.16xlarge
On-demand	$6.877/hr	$5.98/hr13% less
Lowest rate	$5.501/hr1-yr savings plan, hourly commitment	$4.784/hr13% less1-yr savings plan, hourly commitment
Size	32 vCPUs, 256 GiB	64 vCPUs, 256 GiB

Prices in US East (N. Virginia)

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

Option	db.m8a.16xlarge	db.m8i.16xlarge	db.m8i.16xlarge vs db.m8a.16xlarge
On-demandPay by the hour	$6.877	$5.98	▼ 13%
1-yr reservedNo upfront	—	33% off$4.007	—
3-yr reservedNo upfront	—	53% off$2.811	—
1-yr savings planHourly commitment	20% off$5.501	20% off$4.784	▼ 13%

Key differences

The biggest lead each one has.

Where db.m8a.16xlarge leads

Physical cores64 vs 32

2× higher

Where db.m8i.16xlarge leads

On-demand price$5.98 vs $6.877 per hour

13% cheaper

vCPUs64 vs 32

2× higher

Specs

13 of 23 specs differ. Those are in bold.

Compute7 of 8 differ	db.m8a.16xlarge	db.m8i.16xlarge
vCPUs	32	64
Physical cores	64	32
Threads per core	1	2
Architecture	x86_64	–
Processor	5th Generation AMD EPYC	–
CPU maker	AMD	Intel
Sustained clock	4.5 GHz	3.9 GHz
Burstable	No	No

MemoryAll 1 match	db.m8a.16xlarge	db.m8i.16xlarge
Memory (GiB)	256	256

Networking1 of 3 differ	db.m8a.16xlarge	db.m8i.16xlarge
Network	30000 Mbps	–
Network baseline	30 Gbps	30 Gbps
Network peak	30 Gbps	30 Gbps

Storage1 of 7 differ	db.m8a.16xlarge	db.m8i.16xlarge
Storage	EBS Only	–
EBS baseline bandwidth	20,000 Mbps	20,000 Mbps
EBS max bandwidth	20,000 Mbps	20,000 Mbps
EBS baseline throughput	2,500 MB/s	2,500 MB/s
EBS max throughput	2,500 MB/s	2,500 MB/s
EBS baseline IOPS	80,000	80,000
EBS max IOPS	80,000	80,000

Instance details3 of 3 differ	db.m8a.16xlarge	db.m8i.16xlarge
Family	m8a	m8i
Category	General purpose	–
Current generation	Yes	–

Other1 of 1 differ	db.m8a.16xlarge	db.m8i.16xlarge
Hardware Basis	m8a.16xlarge	m8i.16xlarge

On-demand prices by region

Cheapest for db.m8a.16xlarge first. PostgreSQL, USD per hour.

Region	db.m8a.16xlarge	db.m8i.16xlarge	Difference
US East (N. Virginia)Used in summaryus-east-1	$6.877	$5.98	▼ 13%
US East (Ohio)us-east-2	$6.877	$5.98	▼ 13%
US West (Oregon)us-west-2	$6.877	$5.98	▼ 13%
EU (Ireland)eu-west-1	$7.613	$6.619	▼ 13%
Europe (Spain)eu-south-2	$7.613	$6.62	▼ 13%
EU (Frankfurt)eu-central-1	$8.192	$7.12	▼ 13%
Asia Pacific (Tokyo)ap-northeast-1	$9.546	$8.30	▼ 13%
Asia Pacific (Hyderabad)ap-south-2	$9.779	$8.50	▼ 13%
Asia Pacific (Mumbai)ap-south-1	$9.779	$8.50	▼ 13%

Keep exploring

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

db.m8a.16xlargeGeneral purpose, m8a family

db.m8a.16xlarge prices and specs Every size in the m8a family

Compare db.m8a.16xlarge with

db.m8g.16xlarge db.r8a.16xlarge

db.m8i.16xlargem8i family

db.m8i.16xlarge prices and specs Every size in the m8i family

Compare db.m8i.16xlarge with

db.m8g.16xlarge db.r8i.16xlarge db.m7i.16xlarge

Pay the committed rate, with commitment protection

The best committed rate on these two is 20–53% 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.