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r5b.4xlarge by Amazon Web Services

r5b.4xlarge is a Memory optimized Gen5 4xlarge server offered by Amazon Web Services with 16 vCPUs, 128 GiB of memory and 0 GB of storage. The pricing starts at 0.2216 USD per hour.
16 vCPU
128 GiB Memory
Spare SCore
13989
(All-cores)
1328
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
r5b.4xlarge
Description
Memory optimized Gen5 4xlarge
Family
r5b
Hw Virt
Status
active
Observed At
2026-07-31T15:15:46.650842

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
0.455867 USD/h 1.192 USD/h
Oregon (US) / us-west-2
0.593767 USD/h 1.192 USD/h
Northern Virgina (US) / us-east-1
0.704325 USD/h 1.192 USD/h
Stockholm (SE) / eu-north-1
0.35295 USD/h 1.2635 USD/h
Quebec (CA) / ca-central-1
0.469467 USD/h 1.304 USD/h
Dublin (IE) / eu-west-1
0.608933 USD/h 1.336 USD/h
Milan (IT) / eu-south-1
0.309133 USD/h 1.4 USD/h
London (GB) / eu-west-2
0.699633 USD/h 1.4 USD/h
Seoul (KR) / ap-northeast-2
0.556967 USD/h 1.424 USD/h
Frankfurt (DE) / eu-central-1
0.592833 USD/h 1.424 USD/h
Singapore (SG) / ap-southeast-1
0.652167 USD/h 1.424 USD/h
Tokyo (JP) / ap-northeast-1
0.443233 USD/h 1.448 USD/h
Sydney (AU) / ap-southeast-2
0.546267 USD/h 1.448 USD/h
Sao Paulo (BR) / sa-east-1
1.005867 USD/h 1.896 USD/h

Processor

vCPUs
16
Hypervisor
nitro
CPU Allocation
Dedicated
CPU Cores
8
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
256 KiB
CPU L1I Cache
32 KiB
CPU L1I Cache Total
256 KiB
CPU L2 Cache
1 MiB
CPU L2 Cache Total
8 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
10.5
Scalability
131.25

System Resources and Accelerators

MEMORY
Memory Amount
128 GiB
Memory Amount Actual
128 GiB
Memory Generation
DDR4
Memory Speed
2933 Mhz
GPU
GPU Count
0
GPU Memory Min
0 MiB
GPU Memory Total
0 MiB
GPUs
    STORAGE
    Storage Size
    0 GB
    Storages
      NETWORK
      Network Speed Baseline
      5 Gbps
      Network Speed Max
      10 Gbps
      Network Storage Speed Baseline
      10 Gbps
      Network Storage Speed Max
      10 Gbps
      Inbound Traffic
      0 GB/month
      Outbound Traffic
      0 GB/month
      IPv4
      0

      Server Description

      An x86_64 memory-optimized instance featuring a high memory-to-core ratio and dedicated Intel Xeon processing for memory-bound workloads.

      Memory OptimizedGeneral Purpose

      Amazon Web Services r5b.4xlarge is an x86_64 memory-optimized instance featuring 16 vCPUs and 128.0 GB of DDR4 RAM, running on the Nitro hypervisor. Powered by an Intel Xeon 8259CL processor at 3.1 GHz, it delivers a high memory-to-vCPU ratio of 8.0 GB per core. The instance does not include local storage or GPU accelerators, and it operates with a baseline network bandwidth of 5 Gbps. Benchmark data indicates average multi-core CPU and memory bandwidth performance, contrasted by weak single-core processing speeds. This hardware profile is suited for memory-intensive applications, in-memory caching, and database operations that do not require local NVMe storage, offering a balanced resource density for memory-bound workloads.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      0.758Score
      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) 1,362,813 ops/sec 1,896,415 ops/sec 0.719 50.00% 50.00% -15.20%
      Redis RPS (pipeline=16, SET) 8,476,331 ops/sec 11,539,523 ops/sec 0.735 20.00% 20.00% -5.97%
      PassMark Memory Mark (composite) 2,187 2,411 0.907 10.00% 10.00% -0.97%
      Memory bandwidth (read, 16 MB ~ L3) 93,566 MB/sec 107,368 MB/sec 0.871 10.00% 10.00% -1.37%
      PassMark single-thread CPU 1,812 Mops/s 2,363 Mops/s 0.767 10.00% 10.00% -2.62%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 1,133

      Geekbench Multi-Core

      Score: 6,974

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 14306
      Compression
      		 201443
      Encryption
      		 6239
      Extended Instructions
      		 12272
      Floating Point Maths
      		 24301
      Integer Maths
      		 45361
      Physics
      		 1407
      Prime Numbers
      		 75
      Single Threaded
      		 1812
      String Sorting
      		 23430

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2187
      Database Operations
      		 5120
      Memory Latency
      		 61
      Memory Read Cached
      		 22120
      Memory Read Uncached
      		 8459
      Memory Write
      		 7839

      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

      INSTANCEvCPUsMEMORYGPUs
      r5b.large 216 GiB0
      r5b.xlarge 432 GiB0
      r5b.2xlarge 864 GiB0
      r5b.8xlarge 32256 GiB0
      r5b.12xlarge 48384 GiB0
      r5b.16xlarge 64512 GiB0
      r5b.24xlarge 96768 GiB0

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      r5b.4xlarge FAQs