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r8i-flex.16xlarge by Amazon Web Services

r8i-flex.16xlarge is a Memory optimized [Intel 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 0.4726 USD per hour.
64 vCPU
512 GiB Memory
Spare SCore
69310
(All-cores)
2131
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
r8i-flex.16xlarge
Description
Memory optimized [Intel processors] Gen8 16xlarge
Family
r8i-flex
Hw Virt
Status
active
Observed At
2026-07-31T07:33:32.563118

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
1.2914 USD/h 4.223 USD/h
Northern Virgina (US) / us-east-1
2.34478 USD/h 4.223 USD/h
Oregon (US) / us-west-2
1.8638 USD/h 4.223 USD/h
(MY) / ap-southeast-5
1.506633 USD/h 4.3302 USD/h
Mumbai (IN) / ap-south-1
1.198267 USD/h 4.3571 USD/h
Hyderabad (IN) / ap-south-2
1.5813 USD/h 4.3571 USD/h
Stockholm (SE) / eu-north-1
0.9519 USD/h 4.4912 USD/h
Quebec (CA) / ca-central-1
2.8574 USD/h 4.6253 USD/h
California (US) / us-west-1
2.7974 USD/h 4.6922 USD/h
Aragón (ES) / eu-south-2
0.841767 USD/h 4.7258 USD/h
Dublin (IE) / eu-west-1
2.409433 USD/h 4.7258 USD/h
Paris (FR) / eu-west-3
2.681833 USD/h 4.9603 USD/h
London (GB) / eu-west-2
2.120667 USD/h 4.9603 USD/h
Sydney (AU) / ap-southeast-2
2.3967 USD/h 5.0611 USD/h
Seoul (KR) / ap-northeast-2
1.746875 USD/h 5.0944 USD/h
Singapore (SG) / ap-southeast-1
2.196267 USD/h 5.0944 USD/h
Tokyo (JP) / ap-northeast-1
2.215533 USD/h 5.0944 USD/h
Frankfurt (DE) / eu-central-1
2.851467 USD/h 5.0944 USD/h
(NZ) / ap-southeast-6
1.8634 USD/h 5.3139 USD/h
Zurich (CH) / eu-central-2
2.1947 USD/h 5.6038 USD/h
Cape Town (ZA) / af-south-1
1.0413 USD/h 5.6307 USD/h
Sao Paulo (BR) / sa-east-1
3.974233 USD/h 6.7366 USD/h

Processor

vCPUs
64
Hypervisor
nitro
CPU Allocation
Dedicated
CPU Cores
32
CPU Speed
3.9 GHz
CPU Architecture
x86_64
CPU Manufacturer
Intel
CPU Family
Xeon
CPU Model
6975P-C
CPU L1D Cache
48 KiB
CPU L1D Cache Total
2 MiB
CPU L1I Cache
64 KiB
CPU L1I Cache Total
2 MiB
CPU L2 Cache
2 MiB
CPU L2 Cache Total
64 MiB
CPU L3 Cache
480 MiB
CPU L3 Cache Total
480 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, rep_good, nopl, xtopology, nonstop_tsc, cpuid, tsc_known_freq, pni, pclmulqdq, ssse3, fma, cx16, pdcm, pcid, sse4_1, sse4_2, x2apic, movbe, popcnt, tsc_deadline_timer, aes, xsave, avx, f16c, rdrand, hypervisor, lahf_lm, abm, 3dnowprefetch, cpuid_fault, ssbd, ibrs, ibpb, stibp, ibrs_enhanced, 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, wbnoinvd, ida, arat, avx512vbmi, umip, pku, ospke, waitpkg, avx512_vbmi2, gfni, vaes, vpclmulqdq, avx512_vnni, avx512_bitalg, tme, avx512_vpopcntdq, rdpid, bus_lock_detect, cldemote, movdiri, movdir64b, md_clear, serialize, amx_bf16, avx512_fp16, amx_tile, amx_int8, flush_l1d, arch_capabilities
Ecpus
32.5
Scalability
101.56

System Resources and Accelerators

MEMORY
Memory Amount
512 GiB
Memory Amount Actual
512 GiB
Memory Generation
DDR5
Memory Speed
7200 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
      15 Gbps
      Network Speed Max
      30 Gbps
      Network Storage Speed Baseline
      10 Gbps
      Network Storage Speed Max
      20 Gbps
      Inbound Traffic
      0 GB/month
      Outbound Traffic
      0 GB/month
      IPv4
      0

      Server Description

      A memory-optimized virtual server featuring high-speed DDR5 RAM and advanced Intel matrix extensions for demanding database and inference workloads.

      Memory OptimizedGeneral Purpose

      Amazon Web Services r8i-flex.16xlarge is a memory-optimized server instance built on the Nitro hypervisor and powered by an Intel Xeon 6975P-C processor. It features 64 vCPUs, 32 physical cores running at 3.9 GHz, and 512.0 GB of high-speed 7 GHz DDR5 memory, delivering 8.0 GB of RAM per core. The x86_64 architecture supports AVX-512 and Intel AMX instructions, which enhance vector and matrix calculations. While the instance lacks local storage and dedicated GPUs, it provides a baseline network bandwidth of 15 Gbps. Benchmark data highlights top-tier performance in software compilation, text processing, and static web serving, alongside strong multi-core CPU and database execution. This configuration offers a cost-effective profile for memory-intensive, read-heavy workloads, making it highly suitable for large-memory databases, Redis caching, and CPU-based machine learning inference.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      4.42Score
      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) 13,875,736 ops/sec 1,896,415 ops/sec 7.32 50.00% 50.00% +171.00%
      Redis RPS (pipeline=16, SET) 77,699,028 ops/sec 11,539,523 ops/sec 6.73 20.00% 20.00% +46.40%
      PassMark Memory Mark (composite) 2,470 2,411 1.02 10.00% 10.00% +0.20%
      Memory bandwidth (read, 16 MB ~ L3) 225,982 MB/sec 107,368 MB/sec 2.1 10.00% 10.00% +7.70%
      PassMark single-thread CPU 3,280 Mops/s 2,363 Mops/s 1.39 10.00% 10.00% +3.35%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 2,181

      Geekbench Multi-Core

      Score: 20,357

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 82965
      Compression
      		 1272039
      Encryption
      		 72453
      Extended Instructions
      		 88635
      Floating Point Maths
      		 239443
      Integer Maths
      		 330600
      Physics
      		 9106
      Prime Numbers
      		 532
      Single Threaded
      		 3280
      String Sorting
      		 163614

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2470
      Database Operations
      		 28528
      Memory Latency
      		 68
      Memory Read Cached
      		 28284
      Memory Read Uncached
      		 9629
      Memory Write
      		 11219

      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
      r8i-flex.large 216 GiB0
      r8i-flex.xlarge 432 GiB0
      r8i-flex.2xlarge 864 GiB0
      r8i-flex.4xlarge 16128 GiB0
      r8i-flex.8xlarge 32256 GiB0
      r8i-flex.12xlarge 48384 GiB0

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      r8i-flex.16xlarge FAQs