r5b.large by Amazon Web Services

r5b.large is a Memory optimized Gen5 large server offered by Amazon Web Services with 2 vCPUs, 16 GiB of memory and 0 GB of storage. The pricing starts at 0.026 USD per hour.
2 vCPU
16 GiB Memory
Spare SCore
1,675
(All-cores)
1,274
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
r5b.large
Description
Memory optimized Gen5 large
Family
r5b
Hw Virt
Status
active
Observed At
2026-09-11T01:32:09.408965

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
0.029367 USD/h 0.149 USD/h
Oregon (US) / us-west-2
0.0489 USD/h 0.149 USD/h
Northern Virgina (US) / us-east-1
0.0509 USD/h 0.149 USD/h
Stockholm (SE) / eu-north-1
0.02605 USD/h 0.1579 USD/h
Quebec (CA) / ca-central-1
0.0928 USD/h 0.163 USD/h
Dublin (IE) / eu-west-1
0.069167 USD/h 0.167 USD/h
Milan (IT) / eu-south-1
0.032967 USD/h 0.175 USD/h
London (GB) / eu-west-2
0.053933 USD/h 0.175 USD/h
Seoul (KR) / ap-northeast-2
0.047767 USD/h 0.178 USD/h
Singapore (SG) / ap-southeast-1
0.0588 USD/h 0.178 USD/h
Frankfurt (DE) / eu-central-1
0.0646 USD/h 0.178 USD/h
Tokyo (JP) / ap-northeast-1
0.0528 USD/h 0.181 USD/h
Sydney (AU) / ap-southeast-2
0.0582 USD/h 0.181 USD/h
Sao Paulo (BR) / sa-east-1
0.037233 USD/h 0.237 USD/h

Processor

vCPUs
2
Hypervisor
nitro
CPU Allocation
Dedicated
CPU Cores
1
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
32 KiB
CPU L1I Cache
32 KiB
CPU L1I Cache Total
32 KiB
CPU L2 Cache
1 MiB
CPU L2 Cache Total
1 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
1.3
Scalability
130

System Resources and Accelerators

MEMORY
Memory Amount
16 GiB
Memory Amount Actual
16 GiB
Memory Generation
DDR4
Memory Speed
2666 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
      0.75 Gbps
      Network Speed Max
      10 Gbps
      Network Storage Speed Baseline
      1.25 Gbps
      Network Storage Speed Max
      10 Gbps
      Inbound Traffic
      0 GB/month
      Outbound Traffic
      0 GB/month
      IPv4
      0

      Server Description

      A memory-optimized instance featuring a high memory-to-vCPU ratio for workloads requiring memory capacity over raw compute performance.

      Memory Optimized

      Amazon Web Services r5b.large is a memory-optimized instance featuring 2 vCPUs and 16.0 GB of DDR4 memory. Powered by an Intel Xeon 8259CL processor running at 3.1 GHz on the Nitro hypervisor, this instance provides a high memory-to-vCPU ratio of 8.0 GB per core. It does not include local storage or GPU accelerators, and operates with a baseline network bandwidth of 1 Gbps. Benchmark results place its compute and memory bandwidth performance in the lower percentiles, with a stress-ng single-core score of 1273.69 and large-block memory read bandwidth of 12.97 GB/sec. Consequently, the r5b.large is best suited for memory-bound workloads with low CPU demands, such as small-scale caching, lightweight database operations, and memory-intensive background processing.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      0.146Score
      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) 168,077 ops/sec 1,917,397 ops/sec 0.0877 50.00% 50.00% -70.40%
      Redis RPS (pipeline=16, SET) 1,066,732 ops/sec 11,681,410 ops/sec 0.0913 20.00% 20.00% -38.00%
      PassMark Memory Mark (composite) 1,592 2,418 0.659 10.00% 10.00% -4.08%
      Memory bandwidth (read, 16 MB ~ L3) 22,071 MB/sec 108,140 MB/sec 0.204 10.00% 10.00% -14.70%
      PassMark single-thread CPU 1,748 Mops/s 2,365 Mops/s 0.739 10.00% 10.00% -2.98%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 1,138

      Geekbench Multi-Core

      Score: 1,356

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 2005
      Compression
      		 25243
      Encryption
      		 770
      Extended Instructions
      		 1447
      Floating Point Maths
      		 3014
      Integer Maths
      		 5607
      Physics
      		 267
      Prime Numbers
      		 12
      Single Threaded
      		 1748
      String Sorting
      		 2966

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 1592
      Database Operations
      		 663
      Memory Latency
      		 60
      Memory Read Cached
      		 21463
      Memory Read Uncached
      		 11292
      Memory Write
      		 8950

      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.xlarge 432 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.large FAQs