r5b.8xlarge
Memory optimized · r5b series · Intel Xeon Platinum 8259 (Cascade Lake)
- vCPU
- 32
- Memory
- 256 GiB
- Linux / hour
- $2.38
- Per month
- $1,740
- Per vCPU-hour
- $0.0745
- Per GiB-hour
- $0.00931
Analysis
The r5b.8xlarge is a memory optimized instance in the r5b series with 32 vCPUs and 256 GiB of memory on Intel Xeon Platinum 8259 (Cascade Lake) (up to 3.1 GHz), which makes it memory-heavy at 8 GiB of memory per vCPU.
Within the same generation and size, the r5a.8xlarge on AMD EPYC 7571 costs $1.81/hour, 24% less ($420 a month). The other variants are the r5.8xlarge at $2.02, the r5ad.8xlarge at $2.10 and the r5d.8xlarge at $2.30.
Running it in N. Virginia instead of São Paulo saves $1,028 a month per instance: $2.38/hour against $3.79/hour, a 59% spread. It is not offered in Mumbai, so plan around that if you need a presence there.
On demand it costs $2.38/hour in US East (N. Virginia), $1,740 a month if left running, which puts it mid-table for memory optimized types at the 40th percentile per vCPU ($0.0745 per vCPU-hour) and the 56th percentile per GiB ($0.00931 per GiB-hour).
Looking beyond its own line, 17 of 41 current types with 32 vCPUs and similar memory are cheaper. The cheapest of those is the r6g.8xlarge on AWS Graviton2 at $1.61/hour.
It is size 5 of 8 in the r5b series. Stepping up to the r5b.12xlarge gives 48 vCPUs and 384 GiB for $870 more a month. Dropping to the r5b.4xlarge saves $870 a month.
Price by region (USD per hour)
| Region | Linux | Windows | 1-yr RI | 3-yr RI | |
|---|---|---|---|---|---|
| N. Virginia us-east-1 | $2.38 | $3.86 | $1.50 | $0.9655 | |
| Ohio us-east-2 | $2.38 | $3.86 | $1.50 | $0.9655 | |
| Oregon us-west-2 | $2.38 | $3.86 | $1.50 | $0.9655 | |
| Canada Central ca-central-1 | $2.61 | $4.08 | $1.65 | $1.01 | |
| São Paulo sa-east-1 | $3.79 | $5.26 | $2.39 | $1.56 | |
| Ireland eu-west-1 | $2.67 | $4.14 | $1.68 | $1.10 | |
| London eu-west-2 | $2.80 | $4.27 | $1.77 | $1.18 | |
| Frankfurt eu-central-1 | $2.85 | $4.32 | $1.79 | $1.17 | |
| Singapore ap-southeast-1 | $2.85 | $4.32 | $1.79 | $1.17 | |
| Sydney ap-southeast-2 | $2.90 | $4.37 | $1.82 | $1.17 | |
| Tokyo ap-northeast-1 | $2.90 | $4.37 | $1.82 | $1.19 |
Shared tenancy, no pre-installed software. Reserved rates are standard, no upfront, per hour. Prices as of 2026-11-04.
Same shape, other types
| Type | vCPU | Memory | $/hour | vs r5b.8xlarge |
|---|---|---|---|---|
| r6g.8xlarge AWS Graviton2 Processor | 32 | 256 GiB | $1.61 | -32% |
| r7g.8xlarge AWS Graviton3 Processor | 32 | 256 GiB | $1.71 | -28% |
| r5a.8xlarge AMD EPYC 7571 | 32 | 256 GiB | $1.81 | -24% |
| r6a.8xlarge AMD EPYC 7R13 Processor | 32 | 256 GiB | $1.81 | -24% |
| r6gd.8xlarge AWS Graviton2 Processor | 32 | 256 GiB | $1.84 | -23% |
| r8g.8xlarge AWS Graviton4 Processor | 32 | 256 GiB | $1.89 | -21% |
Cost calculator
Specs
| vCPU | 32 |
|---|---|
| Memory | 256 GiB (8.0 per vCPU) |
| Processor | Intel Xeon Platinum 8259 (Cascade Lake) |
| Clock | 3.1 GHz |
| Storage | EBS only |
| Network | 10 Gigabit |
r5b sizes
| r5b.large | 2 vCPU | $0.1490 |
| r5b.xlarge | 4 vCPU | $0.2980 |
| r5b.2xlarge | 8 vCPU | $0.5960 |
| r5b.4xlarge | 16 vCPU | $1.19 |
| r5b.8xlarge | 32 vCPU | $2.38 |
| r5b.12xlarge | 48 vCPU | $3.58 |
| r5b.16xlarge | 64 vCPU | $4.77 |
| r5b.24xlarge | 96 vCPU | $7.15 |