db.r8a.12xlargevsdb.r8i.12xlarge

db.r8i.12xlarge is 13% cheaper than db.r8a.12xlarge on demand in US East (N. Virginia), saving $690.29 a month. Per vCPU, db.r8a.12xlarge costs 42% less.

At a glance	db.r8a.12xlarge	db.r8i.12xlarge
On-demand	$7.246/hr	$6.30/hr13% less
Lowest rate	$5.796/hr1-yr savings plan, hourly commitment	$5.04/hr13% less1-yr savings plan, hourly commitment
Size	48 vCPUs, 384 GiB	24 vCPUs, 384 GiB
Processor	5th Generation AMD EPYC	Intel Xeon Scalable (Granite Rapids)
Architecture	x86_64	x86_64

Prices in US East (N. Virginia)

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

Option	db.r8a.12xlarge	db.r8i.12xlarge	db.r8i.12xlarge vs db.r8a.12xlarge
On-demandPay by the hour	$7.246	$6.30	▼ 13%
1-yr reservedNo upfront	—	33% off$4.221	—
3-yr reservedNo upfront	—	53% off$2.961	—
1-yr savings planHourly commitment	20% off$5.796	20% off$5.04	▼ 13%

Key differences

The biggest lead each one has.

Where db.r8a.12xlarge leads

vCPUs48 vs 24

2× higher

Where db.r8i.12xlarge leads

On-demand price$6.30 vs $7.246 per hour

13% cheaper

Specs

10 of 24 specs differ. Those are in bold.

Compute6 of 8 differ	db.r8a.12xlarge	db.r8i.12xlarge
vCPUs	48	24
Physical cores	48	24
Threads per core	1	2
Architecture	x86_64	x86_64
Processor	5th Generation AMD EPYC	Intel Xeon Scalable (Granite Rapids)
CPU maker	AMD	Intel
Sustained clock	4.5 GHz	3.9 GHz
Burstable	No	No

MemoryAll 1 match	db.r8a.12xlarge	db.r8i.12xlarge
Memory (GiB)	384	384

Networking1 of 3 differ	db.r8a.12xlarge	db.r8i.12xlarge
Network	22500 Mbps	22500 Megabit
Network baseline	22.5 Gbps	22.5 Gbps
Network peak	22.5 Gbps	22.5 Gbps

StorageAll 7 match	db.r8a.12xlarge	db.r8i.12xlarge
Storage	EBS Only	EBS Only
EBS baseline bandwidth	15,000 Mbps	15,000 Mbps
EBS max bandwidth	15,000 Mbps	15,000 Mbps
EBS baseline throughput	1,875 MB/s	1,875 MB/s
EBS max throughput	1,875 MB/s	1,875 MB/s
EBS baseline IOPS	60,000	60,000
EBS max IOPS	60,000	60,000

Instance details2 of 4 differ	db.r8a.12xlarge	db.r8i.12xlarge
Family	r8a	r8i
Category	Memory optimized	Memory optimized
Current generation	Yes	Yes
Normalization factor	96	–

Other1 of 1 differ	db.r8a.12xlarge	db.r8i.12xlarge
Hardware Basis	r8a.12xlarge	r8i.12xlarge

On-demand prices by region

Cheapest for db.r8a.12xlarge first. PostgreSQL, USD per hour.

Region	db.r8a.12xlarge	db.r8i.12xlarge	Difference
US East (N. Virginia)Used in summaryus-east-1	$7.246	$6.30	▼ 13%
US East (Ohio)us-east-2	$7.246	$6.30	▼ 13%
US West (Oregon)us-west-2	$7.246	$6.30	▼ 13%
Canada (Central)ca-central-1	$7.824	$6.80	▼ 13%
EU (Ireland)eu-west-1	$8.114	$7.06	▼ 13%
Europe (Spain)eu-south-2	$8.114	$7.06	▼ 13%
Asia Pacific (Tokyo)ap-northeast-1	$8.695	$7.56	▼ 13%
EU (Frankfurt)eu-central-1	$8.839	$7.69	▼ 13%

Keep exploring

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

db.r8a.12xlargeMemory optimized, r8a family

db.r8a.12xlarge prices and specs Every size in the r8a family

Compare db.r8a.12xlarge with

db.r8g.12xlarge db.m8a.12xlarge

db.r8i.12xlargeMemory optimized, r8i family

db.r8i.12xlarge prices and specs Every size in the r8i family

Compare db.r8i.12xlarge with

db.m8i.12xlarge db.r8g.12xlarge db.r7i.12xlarge

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.