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r8a.12xlarge by Amazon Web Services

r8a.12xlarge is a Memory optimized [AMD processors] Gen8 12xlarge server offered by Amazon Web Services with 48 vCPUs, 384 GiB of memory and 0 GB of storage. The pricing starts at 0.8969 USD per hour.
48 vCPU
384 GiB Memory
Spare SCore
179001
(All-cores)
3768
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
r8a.12xlarge
Description
Memory optimized [AMD processors] Gen8 12xlarge
Family
r8a
Hw Virt
Status
active
Observed At
2026-07-26T16:53:00.834193

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
1.2666 USD/h 3.8342 USD/h
Oregon (US) / us-west-2
1.745375 USD/h 3.8342 USD/h
Northern Virgina (US) / us-east-1
1.59094 USD/h 3.8342 USD/h
Aragón (ES) / eu-south-2
0.902733 USD/h 4.2905 USD/h
Dublin (IE) / eu-west-1
1.69445 USD/h 4.2905 USD/h
Tokyo (JP) / ap-northeast-1
1.2651 USD/h 4.6253 USD/h
Frankfurt (DE) / eu-central-1
1.700067 USD/h 4.6253 USD/h

Processor

vCPUs
48
Hypervisor
nitro
CPU Allocation
Dedicated
CPU Cores
48
CPU Speed
4.5 GHz
CPU Architecture
x86_64
CPU Manufacturer
AMD
CPU Family
EPYC
CPU Model
9R45
CPU L1D Cache
48 KiB
CPU L1D Cache Total
2 MiB
CPU L1I Cache
32 KiB
CPU L1I Cache Total
2 MiB
CPU L2 Cache
1 MiB
CPU L2 Cache Total
48 MiB
CPU L3 Cache
32 MiB
CPU L3 Cache Total
192 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, ht, syscall, nx, mmxext, fxsr_opt, pdpe1gb, rdtscp, lm, constant_tsc, rep_good, nopl, xtopology, nonstop_tsc, cpuid, extd_apicid, aperfmperf, tsc_known_freq, pni, pclmulqdq, monitor, ssse3, fma, cx16, pcid, sse4_1, sse4_2, x2apic, movbe, popcnt, aes, xsave, avx, f16c, rdrand, hypervisor, lahf_lm, cmp_legacy, cr8_legacy, abm, sse4a, misalignsse, 3dnowprefetch, topoext, perfctr_core, ssbd, perfmon_v2, ibrs, ibpb, stibp, ibrs_enhanced, vmmcall, fsgsbase, tsc_adjust, bmi1, avx2, smep, bmi2, erms, invpcid, avx512f, avx512dq, rdseed, adx, smap, avx512ifma, clflushopt, clwb, avx512cd, sha_ni, avx512bw, avx512vl, xsaveopt, xsavec, xgetbv1, xsaves, avx_vnni, avx512_bf16, clzero, xsaveerptr, rdpru, wbnoinvd, arat, avx512vbmi, pku, ospke, avx512_vbmi2, gfni, vaes, vpclmulqdq, avx512_vnni, avx512_bitalg, avx512_vpopcntdq, rdpid, movdiri, movdir64b, fsrm, avx512_vp2intersect, flush_l1d
Ecpus
47.5
Scalability
98.96

System Resources and Accelerators

MEMORY
Memory Amount
384 GiB
Memory Amount Actual
384 GiB
Memory Generation
DDR5
Memory Speed
6400 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
      22.5 Gbps
      Network Speed Max
      22.5 Gbps
      Network Storage Speed Baseline
      15 Gbps
      Network Storage Speed Max
      15 Gbps
      Inbound Traffic
      0 GB/month
      Outbound Traffic
      0 GB/month
      IPv4
      0

      Server Description

      A memory-optimized x86 platform featuring high-frequency AMD EPYC processors and DDR5 memory for demanding database and caching workloads.

      Memory OptimizedGeneral Purpose

      Amazon Web Services r8a.12xlarge is a memory-optimized server instance featuring 48 dedicated physical cores powered by an AMD EPYC 9R45 processor running at 4.5 GHz. Built on the AWS Nitro hypervisor, it provides 384.0 GB of DDR5 memory operating at 6 GHz, translating to 8.0 GB of RAM per core. The instance lacks local storage and dedicated GPUs, relying on a 22 Gbps baseline network bandwidth for external connectivity. In benchmark testing, the r8a.12xlarge delivers top-tier CPU and memory performance, scoring in the top 10% for stress-ng, Geekbench, and PassMark CPU evaluations. It also exhibits high efficiency in database operations, Redis SET transactions, and small-to-medium LLM inference. This profile makes it highly suitable for memory-intensive enterprise workloads, database hosting, and high-throughput caching layers.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      5.56Score
      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) 16,594,804 ops/sec 1,896,415 ops/sec 8.75 50.00% 50.00% +196.00%
      Redis RPS (pipeline=16, SET) 107,067,737 ops/sec 11,539,523 ops/sec 9.28 20.00% 20.00% +56.10%
      PassMark Memory Mark (composite) 2,853 2,411 1.18 10.00% 10.00% +1.67%
      Memory bandwidth (read, 16 MB ~ L3) 355,682 MB/sec 107,368 MB/sec 3.31 10.00% 10.00% +12.70%
      PassMark single-thread CPU 3,833 Mops/s 2,363 Mops/s 1.62 10.00% 10.00% +4.94%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 2,824

      Geekbench Multi-Core

      Score: 29,928

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 102263
      Compression
      		 1473342
      Encryption
      		 75610
      Extended Instructions
      		 125933
      Floating Point Maths
      		 363478
      Integer Maths
      		 362781
      Physics
      		 17162
      Prime Numbers
      		 1261
      Single Threaded
      		 3833
      String Sorting
      		 203587

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2853
      Database Operations
      		 41573
      Memory Latency
      		 85
      Memory Read Cached
      		 33981
      Memory Read Uncached
      		 32624
      Memory Write
      		 33033

      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
      r8a.medium 18 GiB0
      r8a.large 216 GiB0
      r8a.xlarge 432 GiB0
      r8a.2xlarge 864 GiB0
      r8a.4xlarge 16128 GiB0
      r8a.8xlarge 32256 GiB0
      r8a.16xlarge 64512 GiB0

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      r8a.12xlarge FAQs