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r5b.xlarge by Amazon Web Services

r5b.xlarge is a Memory optimized Gen5 xlarge server offered by Amazon Web Services with 4 vCPUs, 32 GiB of memory and 0 GB of storage. The pricing starts at 0.0618 USD per hour.
4 vCPU
32 GiB Memory
Spare SCore
3483
(All-cores)
1324
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
r5b.xlarge
Description
Memory optimized Gen5 xlarge
Family
r5b
Hw Virt
Status
active
Observed At
2026-07-21T22:13:14.054552

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
0.1095 USD/h 0.298 USD/h
Oregon (US) / us-west-2
0.114867 USD/h 0.298 USD/h
Northern Virgina (US) / us-east-1
0.141975 USD/h 0.298 USD/h
Stockholm (SE) / eu-north-1
0.08945 USD/h 0.3159 USD/h
Quebec (CA) / ca-central-1
0.194267 USD/h 0.326 USD/h
Dublin (IE) / eu-west-1
0.1563 USD/h 0.334 USD/h
Milan (IT) / eu-south-1
0.0837 USD/h 0.35 USD/h
London (GB) / eu-west-2
0.142267 USD/h 0.35 USD/h
Seoul (KR) / ap-northeast-2
0.133867 USD/h 0.356 USD/h
Singapore (SG) / ap-southeast-1
0.135767 USD/h 0.356 USD/h
Frankfurt (DE) / eu-central-1
0.169633 USD/h 0.356 USD/h
Tokyo (JP) / ap-northeast-1
0.113933 USD/h 0.362 USD/h
Sydney (AU) / ap-southeast-2
0.1447 USD/h 0.362 USD/h
Sao Paulo (BR) / sa-east-1
0.1415 USD/h 0.474 USD/h

Processor

vCPUs
4
Hypervisor
nitro
CPU Allocation
Dedicated
CPU Cores
2
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
64 KiB
CPU L1I Cache
32 KiB
CPU L1I Cache Total
64 KiB
CPU L2 Cache
1 MiB
CPU L2 Cache Total
2 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
2.6
Scalability
130

System Resources and Accelerators

MEMORY
Memory Amount
32 GiB
Memory Amount Actual
32 GiB
Memory Generation
DDR4
Memory Speed
3200 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
      1.25 Gbps
      Network Speed Max
      10 Gbps
      Network Storage Speed Baseline
      2.5 Gbps
      Network Storage Speed Max
      10 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 for memory-bound workloads with moderate processing requirements.

      Memory OptimizedGeneral Purpose

      Amazon Web Services r5b.xlarge is a memory-optimized instance featuring 4 dedicated vCPUs and 32.0 GB of DDR4 RAM, running on an Intel Xeon 8259CL processor at 3.1 GHz. Built on the AWS Nitro hypervisor, this x86_64 server offers a high memory-to-vCPU ratio of 8.0 GB per core but lacks local storage and is limited to a 1 Gbps baseline network speed. Benchmark data shows average Geekbench single-core and PassMark memory performance, though overall compute and memory bandwidth results generally fall into the bottom 25% tier. This instance provides a cost-effective option for memory-intensive workloads with moderate processing demands, such as small databases, caching layers, and memory-bound enterprise applications.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      0.259Score
      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) 336,458 ops/sec 1,896,415 ops/sec 0.177 50.00% 50.00% -57.90%
      Redis RPS (pipeline=16, SET) 2,132,452 ops/sec 11,539,523 ops/sec 0.185 20.00% 20.00% -28.60%
      PassMark Memory Mark (composite) 2,145 2,411 0.89 10.00% 10.00% -1.16%
      Memory bandwidth (read, 16 MB ~ L3) 35,939 MB/sec 107,368 MB/sec 0.335 10.00% 10.00% -10.40%
      PassMark single-thread CPU 1,799 Mops/s 2,363 Mops/s 0.761 10.00% 10.00% -2.69%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 1,131

      Geekbench Multi-Core

      Score: 2,461

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		3975
      Compression
      		50273
      Encryption
      		1553
      Extended Instructions
      		2988
      Floating Point Maths
      		6044
      Integer Maths
      		11289
      Physics
      		528
      Prime Numbers
      		24
      Single Threaded
      		1799
      String Sorting
      		5986

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		2145
      Database Operations
      		1388
      Memory Latency
      		55
      Memory Read Cached
      		22292
      Memory Read Uncached
      		11382
      Memory Write
      		10497

      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.2xlarge 864 GiB0
      r5b.4xlarge 16128 GiB0
      r5b.8xlarge 32256 GiB0
      r5b.12xlarge 48384 GiB0
      r5b.16xlarge 64512 GiB0
      r5b.24xlarge 96768 GiB0

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      r5b.xlarge FAQs