r5b.16xlarge by Amazon Web Services

r5b.16xlarge is a Memory optimized Gen5 16xlarge server offered by Amazon Web Services with 64 vCPUs, 512 GiB of memory and 0 GB of storage. The pricing starts at 0.5054 USD per hour.
64 vCPU
512 GiB Memory
Spare SCore
54,544
(All-cores)
1,285
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
r5b.16xlarge
Description
Memory optimized Gen5 16xlarge
Family
r5b
Hw Virt
Status
active
Observed At
2026-10-31T04:43:58.181387

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
1.7869 USD/h 4.768 USD/h
Northern Virgina (US) / us-east-1
2.010975 USD/h 4.768 USD/h
Oregon (US) / us-west-2
2.392 USD/h 4.768 USD/h
Stockholm (SE) / eu-north-1
0.5054 USD/h 5.0541 USD/h
Quebec (CA) / ca-central-1
1.6368 USD/h 5.216 USD/h
Dublin (IE) / eu-west-1
2.544867 USD/h 5.344 USD/h
Milan (IT) / eu-south-1
1.0607 USD/h 5.6 USD/h
London (GB) / eu-west-2
2.1574 USD/h 5.6 USD/h
Seoul (KR) / ap-northeast-2
1.511133 USD/h 5.696 USD/h
Singapore (SG) / ap-southeast-1
2.134667 USD/h 5.696 USD/h
Frankfurt (DE) / eu-central-1
2.093767 USD/h 5.696 USD/h
Tokyo (JP) / ap-northeast-1
1.527433 USD/h 5.792 USD/h
Sydney (AU) / ap-southeast-2
2.220633 USD/h 5.792 USD/h
Sao Paulo (BR) / sa-east-1
1.416967 USD/h 7.584 USD/h

Processor

vCPUs
64
Hypervisor
nitro
CPU Allocation
Dedicated
CPU Cores
32
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
1 MiB
CPU L1I Cache
32 KiB
CPU L1I Cache Total
1 MiB
CPU L2 Cache
1 MiB
CPU L2 Cache Total
32 MiB
CPU L3 Cache
36 MiB
CPU L3 Cache Total
72 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
42.4
Scalability
66.25

System Resources and Accelerators

MEMORY
Memory Amount
512 GiB
Memory Amount Actual
512 GiB
Memory Generation
DDR4
Memory Speed
2933 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
      20 Gbps
      Network Speed Max
      20 Gbps
      Network Storage Speed Baseline
      40 Gbps
      Network Storage Speed Max
      40 Gbps
      Inbound Traffic
      0 GB/month
      Outbound Traffic
      0 GB/month
      IPv4
      0

      Server Description

      A memory-optimized virtual server featuring high-density DDR4 RAM and strong large-block memory bandwidth for demanding database and caching workloads.

      Memory Optimized

      Amazon Web Services r5b.16xlarge is a memory-optimized server instance utilizing the AWS Nitro hypervisor and an x86_64 Intel Xeon 8259CL processor running at 3.1 GHz. It features 64 vCPUs across 32 physical cores, 512.0 GB of DDR4 memory, and a baseline network bandwidth of 20 Gbps, with no local storage or GPUs. Performance benchmarks show strong memory bandwidth for large block read and write operations, though single-core CPU performance and single-threaded compression tasks represent a clear tradeoff, scoring in the bottom 25 percent. Multi-core processing, database operations, and software compilation benchmarks consistently rank in the average tier. This resource profile makes the r5b.16xlarge highly suitable for memory-intensive workloads such as in-memory databases, caching layers, and large-scale data processing applications that benefit from high memory density over raw single-core compute power.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      2.1Score
      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) 5,404,803 ops/sec 1,918,343 ops/sec 2.8 50.00% 50.00% +67.00%
      Redis RPS (pipeline=16, SET) 31,883,072 ops/sec 11,704,734 ops/sec 2.7 20.00% 20.00% +22.00%
      PassMark Memory Mark (composite) 2,280 2,416 0.96 10.00% 10.00% -0.41%
      Memory bandwidth (read, 16 MB ~ L3) 239,862 MB/sec 108,466 MB/sec 2.2 10.00% 10.00% +8.20%
      PassMark single-thread CPU 1,819 Mops/s 2,365 Mops/s 0.75 10.00% 10.00% -2.80%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 1,209

      Geekbench Multi-Core

      Score: 11,786

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 41,629
      Compression
      		 787,517
      Encryption
      		 24,664
      Extended Instructions
      		 48,892
      Floating Point Maths
      		 96,695
      Integer Maths
      		 180,136
      Physics
      		 3,762
      Prime Numbers
      		 199
      Single Threaded
      		 1,819
      String Sorting
      		 91,140

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2,280
      Database Operations
      		 19,499
      Memory Latency
      		 61
      Memory Read Cached
      		 22,000
      Memory Read Uncached
      		 8,407
      Memory Write
      		 7,837

      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.8xlarge 32256 GiB0
      r5b.12xlarge 48384 GiB0
      r5b.24xlarge 96768 GiB0

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      r5b.16xlarge FAQs