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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 0.6278 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
2026-06-24T16:31:26.662314

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
1.493267 USD/h 3.576 USD/h
Oregon (US) / us-west-2
1.619533 USD/h 3.576 USD/h
Northern Virgina (US) / us-east-1
2.259125 USD/h 3.576 USD/h
Stockholm (SE) / eu-north-1
0.91345 USD/h 3.7906 USD/h
Quebec (CA) / ca-central-1
1.954667 USD/h 3.912 USD/h
Dublin (IE) / eu-west-1
1.733167 USD/h 4.008 USD/h
Milan (IT) / eu-south-1
0.838133 USD/h 4.2 USD/h
London (GB) / eu-west-2
1.829 USD/h 4.2 USD/h
Seoul (KR) / ap-northeast-2
1.533333 USD/h 4.272 USD/h
Singapore (SG) / ap-southeast-1
1.812433 USD/h 4.272 USD/h
Frankfurt (DE) / eu-central-1
2.038 USD/h 4.272 USD/h
Tokyo (JP) / ap-northeast-1
0.9735 USD/h 4.344 USD/h
Sydney (AU) / ap-southeast-2
1.796967 USD/h 4.344 USD/h
Sao Paulo (BR) / sa-east-1
3.246333 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 virtual server featuring forty-eight vCPUs and three hundred eighty-four gigabytes of RAM for memory-intensive database 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 an Intel Xeon 8259CL processor running at 3.1 GHz 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. Benchmarks show average multi-core CPU and memory bandwidth performance, alongside weaker single-core execution. This hardware profile is optimized for memory-intensive workloads such as database operations and in-memory caching rather than compute-heavy or single-threaded tasks.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      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

      Similar Servers

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      r5b.12xlarge FAQs