r5b family
The r5b family has 19 sizes on AWS RDS, from 2 to 96 vCPUs and 16 to 768 GiB of memory. In US East (N. Virginia), on-demand prices run $0.296 to $14.208 per hour for PostgreSQL, Single-AZ. It is sold in 14 regions and listed as memory optimized.
Sizes and prices in US East (N. Virginia)
| Type | vCPUs | Memory (GiB) | Tier | On-demand /hr | 1-yr reserved /hr |
|---|---|---|---|---|---|
| db.r5b.large | 2 | 16 | $0.296 | $0.1714 | |
| db.r5b.large.tpc1.mem2x | 2 | 32 | Oracle Enterprise BYOL | $0.551 | – |
| db.r5b.xlarge | 4 | 32 | $0.592 | $0.3429 | |
| db.r5b.2xlarge | 8 | 64 | $1.184 | $0.6858 | |
| db.r5b.2xlarge.tpc1.mem2x | 8 | 128 | Oracle Enterprise BYOL | $2.205 | – |
| db.r5b.2xlarge.tpc2.mem4x | 8 | 256 | Oracle Enterprise BYOL | $4.41 | – |
| db.r5b.4xlarge | 16 | 128 | $2.368 | $1.372 | |
| db.r5b.4xlarge.tpc2.mem2x | 16 | 256 | Oracle Enterprise BYOL | $4.41 | – |
| db.r5b.4xlarge.tpc2.mem3x | 16 | 384 | Oracle Enterprise BYOL | $6.615 | – |
| db.r5b.4xlarge.tpc2.mem4x | 16 | 512 | Oracle Enterprise BYOL | $8.821 | – |
| db.r5b.6xlarge.tpc2.mem4x | 24 | 768 | Oracle Enterprise BYOL | $13.231 | – |
| db.r5b.8xlarge | 32 | 256 | $4.736 | $2.743 | |
| db.r5b.12xlarge | 48 | 384 | $7.104 | $4.115 | |
| db.r5b.16xlarge | 64 | 512 | $9.472 | $5.486 | |
| db.r5b.24xlarge | 96 | 768 | $14.208 | $8.229 | |
| db.r5b.2xlarge.tpc2.mem8x | – | – | Oracle Enterprise BYOL | $8.821 | – |
| db.r5b.8xlarge.tpc2.mem3x | – | – | Oracle Enterprise BYOL | $13.231 | – |
| db.r5b.xlarge.tpc2.mem2x | – | – | Oracle Enterprise BYOL | $1.103 | – |
| db.r5b.xlarge.tpc2.mem4x | – | – | Oracle Enterprise BYOL | $2.205 | – |
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Prices in USD per hour for PostgreSQL, Single-AZ; reserved prices are 1 year, no upfront. Updated 2026-11-12 from AWS public price lists. Compare all AWS RDS sizes.