r5b.8xlarge by Amazon Web Services

r5b.8xlarge is a Memory optimized Gen5 8xlarge server offered by Amazon Web Services with 32 vCPUs, 256 GiB of memory and 0 GB of storage. The pricing starts at 0.2669 USD per hour.
32 vCPU
256 GiB Memory
Spare SCore
27,089
(All-cores)
1,286
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
r5b.8xlarge
Description
Memory optimized Gen5 8xlarge
Family
r5b
Hw Virt
Status
active
Observed At
2026-10-31T18:38:36.500315

Availability

REGION / IDSPOTONDEMAND
Northern Virgina (US) / us-east-1
1.0496 USD/h 2.384 USD/h
Ohio (US) / us-east-2
1.007267 USD/h 2.384 USD/h
Oregon (US) / us-west-2
1.2641 USD/h 2.384 USD/h
Stockholm (SE) / eu-north-1
0.3191 USD/h 2.527 USD/h
Quebec (CA) / ca-central-1
0.8224 USD/h 2.608 USD/h
Dublin (IE) / eu-west-1
1.318433 USD/h 2.672 USD/h
Milan (IT) / eu-south-1
0.530867 USD/h 2.8 USD/h
London (GB) / eu-west-2
0.8994 USD/h 2.8 USD/h
Seoul (KR) / ap-northeast-2
0.980567 USD/h 2.848 USD/h
Frankfurt (DE) / eu-central-1
1.059767 USD/h 2.848 USD/h
Singapore (SG) / ap-southeast-1
1.565433 USD/h 2.848 USD/h
Tokyo (JP) / ap-northeast-1
0.962533 USD/h 2.896 USD/h
Sydney (AU) / ap-southeast-2
1.0903 USD/h 2.896 USD/h
Sao Paulo (BR) / sa-east-1
0.591733 USD/h 3.792 USD/h

Processor

vCPUs
32
Hypervisor
nitro
CPU Allocation
Dedicated
CPU Cores
16
CPU Speed
3.1 GHz
CPU Architecture
x86_64
CPU Manufacturer
Intel
CPU Family
Xeon
CPU Model
8259CL
CPU L1D Cache
32 KiB
CPU L1D Cache Total
512 KiB
CPU L1I Cache
32 KiB
CPU L1I Cache Total
512 KiB
CPU L2 Cache
1 MiB
CPU L2 Cache Total
16 MiB
CPU L3 Cache
36 MiB
CPU L3 Cache Total
36 MiB
CPU Flags
fpu, vme, de, pse, tsc, msr, pae, mce, cx8, apic, sep, mtrr, pge, mca, cmov, pat, pse36, clflush, mmx, fxsr, sse, sse2, ss, ht, syscall, nx, pdpe1gb, rdtscp, lm, constant_tsc, rep_good, nopl, xtopology, nonstop_tsc, cpuid, aperfmperf, tsc_known_freq, pni, pclmulqdq, ssse3, fma, cx16, pcid, sse4_1, sse4_2, x2apic, movbe, popcnt, tsc_deadline_timer, aes, xsave, avx, f16c, rdrand, hypervisor, lahf_lm, abm, 3dnowprefetch, pti, fsgsbase, tsc_adjust, bmi1, avx2, smep, bmi2, erms, invpcid, mpx, avx512f, avx512dq, rdseed, adx, smap, clflushopt, clwb, avx512cd, avx512bw, avx512vl, xsaveopt, xsavec, xgetbv1, xsaves, ida, arat, pku, ospke, avx512_vnni
Ecpus
21.1
Scalability
65.94

System Resources and Accelerators

MEMORY
Memory Amount
256 GiB
Memory Amount Actual
256 GiB
Memory Generation
DDR4
Memory Speed
3200 Mhz
ACCELERATORS
Accelerator Count
0
Accelerator Memory Min
0 MiB
Accelerator Memory Total
0 MiB
Accelerators
    STORAGE
    Storage Size
    0 GB
    Storages
      NETWORK
      Network Speed Baseline
      10 Gbps
      Network Speed Max
      10 Gbps
      Network Storage Speed Baseline
      20 Gbps
      Network Storage Speed Max
      20 Gbps
      Inbound Traffic
      0 GB/month
      Outbound Traffic
      0 GB/month
      IPv4
      0

      Server Description

      A memory-optimized virtual server featuring a high RAM-to-vCPU ratio and dedicated Intel Xeon processors for memory-intensive enterprise workloads.

      Memory OptimizedGeneral Purpose

      Amazon Web Services r5b.8xlarge is a memory-optimized server instance utilizing the Nitro hypervisor and an x86_64 Intel Xeon 8259CL processor. It features 32 vCPUs (16 physical cores) operating at 3.1 GHz, paired with 256.0 GB of DDR4 RAM, resulting in an 8.0 GB per core memory allocation. The instance does not include local storage or GPU accelerators, and it provides a baseline network bandwidth of 10 Gbps. Performance benchmarks indicate weak single-core CPU and single-threaded compression capabilities, but average multi-core and memory bandwidth performance. This resource profile is qualitatively cost-efficient for memory-heavy workloads that do not demand extreme single-thread speeds. It is suited for database operations, caching systems like Redis, and memory-intensive enterprise applications.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      1.2Score
      Precomputed compound score for Cache Intensive workloads. A weighted average (geometric mean) of benchmark scores compared to their medians: score = ∏ (x_i / m_i)^(w_i / Σw). The score of 1.0 represents a synthetic baseline server with the median performance of each component benchmark; 0.5 means roughly half the performance; and 2.0 means twice the performance of that reference profile. Component weights: 50% Redis RPS (pipeline=1, SET), 20% Redis RPS (pipeline=16, SET), 10% PassMark Memory Mark (composite), 10% Memory bandwidth (read, 16 MB ~ L3), 10% PassMark single-thread CPU. Rationale for component selection: In-memory key-value store workload, mixing direct Redis performance metrics with memory speed and latency benchmarks, and single-core CPU performance profiles.
      Component Score Weight Impact
      Raw Reference Normalized Target Actual
      Redis RPS (pipeline=1, SET) 2,786,061 ops/sec 1,918,343 ops/sec 1.5 50.00% 50.00% +22.00%
      Redis RPS (pipeline=16, SET) 16,259,215 ops/sec 11,704,734 ops/sec 1.3 20.00% 20.00% +5.40%
      PassMark Memory Mark (composite) 2,569 2,416 1.1 10.00% 10.00% +0.96%
      Memory bandwidth (read, 16 MB ~ L3) 90,100 MB/sec 108,466 MB/sec 0.82 10.00% 10.00% -2.00%
      PassMark single-thread CPU 1,816 Mops/s 2,365 Mops/s 0.75 10.00% 10.00% -2.80%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 1,175

      Geekbench Multi-Core

      Score: 10,096

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 25,455
      Compression
      		 398,924
      Encryption
      		 12,454
      Extended Instructions
      		 24,943
      Floating Point Maths
      		 48,674
      Integer Maths
      		 90,812
      Physics
      		 2,331
      Prime Numbers
      		 128
      Single Threaded
      		 1,816
      String Sorting
      		 46,330

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2,569
      Database Operations
      		 10,430
      Memory Latency
      		 53
      Memory Read Cached
      		 22,213
      Memory Read Uncached
      		 10,102
      Memory Write
      		 9,914

      Stress-ng Raw Scores

      Stress-ng Relative Multicore Performance

      LLM Inference Speed for Prompt Processing

      LLM Inference Speed for Text Generation

      Static Web Server

      Redis

      Alternatives

      Servers of the Same Family

      INSTANCEvCPUsMEMORYAccelerators
      r5b.large 216 GiB0
      r5b.xlarge 432 GiB0
      r5b.2xlarge 864 GiB0
      r5b.4xlarge 16128 GiB0
      r5b.12xlarge 48384 GiB0
      r5b.16xlarge 64512 GiB0
      r5b.24xlarge 96768 GiB0

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      r5b.8xlarge FAQs