logo

r8a.4xlarge by Amazon Web Services

r8a.4xlarge is a Memory optimized [AMD processors] Gen8 4xlarge server offered by Amazon Web Services with 16 vCPUs, 128 GiB of memory and 0 GB of storage. The pricing starts at 0.3111 USD per hour.
16 vCPU
128 GiB Memory
Spare SCore
60224
(All-cores)
3773
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
r8a.4xlarge
Description
Memory optimized [AMD processors] Gen8 4xlarge
Family
r8a
Hw Virt
Status
active
Observed At
2026-07-26T21:29:48.909254

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
0.385667 USD/h 1.2781 USD/h
Oregon (US) / us-west-2
0.441875 USD/h 1.2781 USD/h
Northern Virgina (US) / us-east-1
0.57622 USD/h 1.2781 USD/h
Aragón (ES) / eu-south-2
0.317967 USD/h 1.4302 USD/h
Dublin (IE) / eu-west-1
0.7129 USD/h 1.4302 USD/h
Tokyo (JP) / ap-northeast-1
0.466333 USD/h 1.5418 USD/h
Frankfurt (DE) / eu-central-1
0.5664 USD/h 1.5418 USD/h

Processor

vCPUs
16
Hypervisor
nitro
CPU Allocation
Dedicated
CPU Cores
16
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
768 KiB
CPU L1I Cache
32 KiB
CPU L1I Cache Total
512 KiB
CPU L2 Cache
1 MiB
CPU L2 Cache Total
16 MiB
CPU L3 Cache
32 MiB
CPU L3 Cache Total
64 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
16
Scalability
100

System Resources and Accelerators

MEMORY
Memory Amount
128 GiB
Memory Amount Actual
128 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
      7.5 Gbps
      Network Speed Max
      15 Gbps
      Network Storage Speed Baseline
      5 Gbps
      Network Storage Speed Max
      10 Gbps
      Inbound Traffic
      0 GB/month
      Outbound Traffic
      0 GB/month
      IPv4
      0

      CPU and System Topology

      Server Description

      A memory-optimized instance featuring high-speed DDR5 memory and dedicated AMD EPYC cores for memory-intensive enterprise workloads.

      Memory OptimizedGeneral Purpose

      Amazon Web Services r8a.4xlarge is a memory-optimized instance featuring 16 dedicated physical cores on an AMD EPYC 9R45 processor running at 4.5 GHz. Built on the Nitro hypervisor, it provides 128.0 GB of high-speed 6 GHz DDR5 memory, yielding an 8:1 RAM-to-vCPU ratio. The instance lacks local storage and GPU accelerators, relying on an 8 Gbps baseline network bandwidth. Performance benchmarks show top-tier single-core CPU execution, image processing, and small-model LLM inference, while multi-core operations and memory bandwidth perform in the average tier. This hardware profile offers qualitative cost efficiency for memory-bound workloads that do not require local NVMe storage. It is highly suited for database hosting, caching layers, text processing, and memory-intensive enterprise applications.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      2.45Score
      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) 5,914,438 ops/sec 1,896,415 ops/sec 3.12 50.00% 50.00% +76.60%
      Redis RPS (pipeline=16, SET) 39,532,059 ops/sec 11,539,523 ops/sec 3.43 20.00% 20.00% +28.00%
      PassMark Memory Mark (composite) 2,841 2,411 1.18 10.00% 10.00% +1.67%
      Memory bandwidth (read, 16 MB ~ L3) 125,678 MB/sec 107,368 MB/sec 1.17 10.00% 10.00% +1.58%
      PassMark single-thread CPU 3,818 Mops/s 2,363 Mops/s 1.62 10.00% 10.00% +4.94%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 2,819

      Geekbench Multi-Core

      Score: 21,849

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 47027
      Compression
      		 528920
      Encryption
      		 25403
      Extended Instructions
      		 49528
      Floating Point Maths
      		 122198
      Integer Maths
      		 121932
      Physics
      		 6182
      Prime Numbers
      		 438
      Single Threaded
      		 3818
      String Sorting
      		 73148

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2841
      Database Operations
      		 20757
      Memory Latency
      		 82
      Memory Read Cached
      		 33950
      Memory Read Uncached
      		 32481
      Memory Write
      		 33010

      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.8xlarge 32256 GiB0
      r8a.12xlarge 48384 GiB0
      r8a.16xlarge 64512 GiB0

      Similar Servers

      INSTANCEVENDORvCPUsMEMORYGPUs

      r8a.4xlarge FAQs