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r8a.16xlarge by Amazon Web Services

r8a.16xlarge is a Memory optimized [AMD processors] Gen8 16xlarge server offered by Amazon Web Services with 64 vCPUs, 512 GiB of memory and 0 GB of storage. The pricing starts at 1.1921 USD per hour.
64 vCPU
512 GiB Memory
Spare SCore
231276
(All-cores)
3773
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
r8a.16xlarge
Description
Memory optimized [AMD processors] Gen8 16xlarge
Family
r8a
Hw Virt
Status
active
Observed At
2026-07-26T21:29:48.906013

Availability

REGION / IDSPOTONDEMAND
Northern Virgina (US) / us-east-1
2.03672 USD/h 5.1123 USD/h
Ohio (US) / us-east-2
1.7623 USD/h 5.1123 USD/h
Oregon (US) / us-west-2
2.294125 USD/h 5.1123 USD/h
Aragón (ES) / eu-south-2
1.935433 USD/h 5.7206 USD/h
Dublin (IE) / eu-west-1
2.25925 USD/h 5.7206 USD/h
Tokyo (JP) / ap-northeast-1
2.424933 USD/h 6.167 USD/h
Frankfurt (DE) / eu-central-1
3.5122 USD/h 6.167 USD/h

Processor

vCPUs
64
Hypervisor
nitro
CPU Allocation
Dedicated
CPU Cores
64
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
3 MiB
CPU L1I Cache
32 KiB
CPU L1I Cache Total
2 MiB
CPU L2 Cache
1 MiB
CPU L2 Cache Total
64 MiB
CPU L3 Cache
32 MiB
CPU L3 Cache Total
256 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
61.3
Scalability
95.78

System Resources and Accelerators

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

      Server Description

      A high-density memory-optimized instance featuring dedicated AMD EPYC cores and high-speed DDR5 RAM for demanding enterprise database workloads.

      Memory OptimizedCompute Optimized

      Amazon Web Services r8a.16xlarge is a memory-optimized server instance designed for memory-intensive and compute-heavy workloads. Powered by an AMD EPYC 9R45 processor, it delivers 64 dedicated physical cores running at 4.5 GHz on the x86_64 architecture, paired with 512.0 GB of DDR5 memory operating at 6 GHz. Running on the AWS Nitro hypervisor, the instance provides a baseline network bandwidth of 30 Gbps but lacks local storage and GPU accelerators. Benchmark data places this server in the top tier for CPU and memory bandwidth performance, with exceptional results in Redis operations and database processing. The high memory-to-core ratio of 8.0 GB per core makes it highly efficient for workloads requiring massive RAM capacity without hyperthreading overhead. It is best suited for in-memory databases, large-scale data analytics, and enterprise applications.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      6.7Score
      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) 20,704,551 ops/sec 1,896,415 ops/sec 10.9 50.00% 50.00% +230.00%
      Redis RPS (pipeline=16, SET) 132,839,353 ops/sec 11,539,523 ops/sec 11.5 20.00% 20.00% +63.00%
      PassMark Memory Mark (composite) 2,781 2,411 1.15 10.00% 10.00% +1.41%
      Memory bandwidth (read, 16 MB ~ L3) 506,928 MB/sec 107,368 MB/sec 4.72 10.00% 10.00% +16.80%
      PassMark single-thread CPU 3,840 Mops/s 2,363 Mops/s 1.63 10.00% 10.00% +5.01%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 2,749

      Geekbench Multi-Core

      Score: 29,002

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 119031
      Compression
      		 1843494
      Encryption
      		 98983
      Extended Instructions
      		 158564
      Floating Point Maths
      		 475353
      Integer Maths
      		 484272
      Physics
      		 21942
      Prime Numbers
      		 1604
      Single Threaded
      		 3840
      String Sorting
      		 252721

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2781
      Database Operations
      		 43220
      Memory Latency
      		 88
      Memory Read Cached
      		 33809
      Memory Read Uncached
      		 32669
      Memory Write
      		 32958

      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.12xlarge 48384 GiB0

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      r8a.16xlarge FAQs