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r5b.12xlarge by Amazon Web Services

r5b.12xlarge is a Memory optimized Gen5 12xlarge server offered by Amazon Web Services with 48 vCPUs, 384 GiB of memory and 0 GB of storage. The pricing starts at 0.4011 USD per hour.
48 vCPU
384 GiB Memory
Spare SCore
40672
(All-cores)
1381
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
r5b.12xlarge
Description
Memory optimized Gen5 12xlarge
Family
r5b
Hw Virt
Status
active
Observed At
2026-08-08T18:40:37.471304

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
1.311733 USD/h 3.576 USD/h
Northern Virgina (US) / us-east-1
2.002775 USD/h 3.576 USD/h
Oregon (US) / us-west-2
1.915167 USD/h 3.576 USD/h
Stockholm (SE) / eu-north-1
0.7023 USD/h 3.7906 USD/h
Quebec (CA) / ca-central-1
1.009 USD/h 3.912 USD/h
Dublin (IE) / eu-west-1
1.7218 USD/h 4.008 USD/h
Milan (IT) / eu-south-1
0.882933 USD/h 4.2 USD/h
London (GB) / eu-west-2
1.433133 USD/h 4.2 USD/h
Seoul (KR) / ap-northeast-2
1.439767 USD/h 4.272 USD/h
Singapore (SG) / ap-southeast-1
1.8969 USD/h 4.272 USD/h
Frankfurt (DE) / eu-central-1
1.840033 USD/h 4.272 USD/h
Tokyo (JP) / ap-northeast-1
0.867233 USD/h 4.344 USD/h
Sydney (AU) / ap-southeast-2
1.5086 USD/h 4.344 USD/h
Sao Paulo (BR) / sa-east-1
2.663333 USD/h 5.688 USD/h

Processor

vCPUs
48
Hypervisor
nitro
CPU Allocation
Dedicated
CPU Cores
24
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
768 KiB
CPU L1I Cache
32 KiB
CPU L1I Cache Total
768 KiB
CPU L2 Cache
1 MiB
CPU L2 Cache Total
24 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, arch_perfmon, rep_good, nopl, xtopology, nonstop_tsc, cpuid, aperfmperf, tsc_known_freq, pni, pclmulqdq, monitor, 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
29.5
Scalability
122.92

System Resources and Accelerators

MEMORY
Memory Amount
384 GiB
Memory Amount Actual
384 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
      12 Gbps
      Network Speed Max
      12 Gbps
      Network Storage Speed Baseline
      30 Gbps
      Network Storage Speed Max
      30 Gbps
      Inbound Traffic
      0 GB/month
      Outbound Traffic
      0 GB/month
      IPv4
      0

      Server Description

      A memory-optimized server configuration featuring high RAM density and average multi-core performance for database and caching workloads.

      Memory OptimizedGeneral Purpose

      Amazon Web Services r5b.12xlarge is a memory-optimized instance featuring 48 vCPUs and 384.0 GB of DDR4 RAM. Powered by a dedicated 3.1 GHz Intel Xeon 8259CL processor on the Nitro hypervisor, this x86_64 server provides 8.0 GB of memory per core. It lacks local storage and GPU accelerators, relying on a 12 Gbps baseline network bandwidth. Performance benchmarks show average multi-core capabilities, including average ratings in PassMark database operations and Redis SET operations, contrasted with weak single-core performance in stress-ng and gzip compression. Memory bandwidth tests for both small cached and large uncached blocks demonstrate average performance. This resource profile makes the instance qualitatively cost-efficient for memory-heavy workloads like database management and caching, where massive RAM capacity is prioritized over high single-threaded CPU speeds.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      1.64Score
      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) 3,952,605 ops/sec 1,910,660 ops/sec 2.07 50.00% 50.00% +43.90%
      Redis RPS (pipeline=16, SET) 23,184,111 ops/sec 11,608,287 ops/sec 2 20.00% 20.00% +14.90%
      PassMark Memory Mark (composite) 2,606 2,416 1.08 10.00% 10.00% +0.77%
      Memory bandwidth (read, 16 MB ~ L3) 112,388 MB/sec 107,896 MB/sec 1.04 10.00% 10.00% +0.39%
      PassMark single-thread CPU 1,944 Mops/s 2,364 Mops/s 0.822 10.00% 10.00% -1.94%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 1,259

      Geekbench Multi-Core

      Score: 11,027

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 34689
      Compression
      		 590496
      Encryption
      		 18578
      Extended Instructions
      		 37005
      Floating Point Maths
      		 73011
      Integer Maths
      		 136283
      Physics
      		 2563
      Prime Numbers
      		 175
      Single Threaded
      		 1944
      String Sorting
      		 69129

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2606
      Database Operations
      		 15595
      Memory Latency
      		 53
      Memory Read Cached
      		 23191
      Memory Read Uncached
      		 10072
      Memory Write
      		 9847

      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.4xlarge 16128 GiB0
      r5b.8xlarge 32256 GiB0
      r5b.16xlarge 64512 GiB0
      r5b.24xlarge 96768 GiB0

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      r5b.12xlarge FAQs