r8i-flex.4xlarge by Amazon Web Services

r8i-flex.4xlarge is a Memory optimized [Intel 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 0.1089 USD per hour.
16 vCPU
128 GiB Memory
Spare SCore
17,341
(All-cores)
2,132
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
r8i-flex.4xlarge
Description
Memory optimized [Intel processors] Gen8 4xlarge
Family
r8i-flex
Hw Virt
Status
active
Observed At
2026-10-27T21:16:36.556385

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
0.230933 USD/h 1.0558 USD/h
Northern Virgina (US) / us-east-1
0.36706 USD/h 1.0558 USD/h
Oregon (US) / us-west-2
0.35945 USD/h 1.0558 USD/h
(MY) / ap-southeast-5
0.312633 USD/h 1.0826 USD/h
Hyderabad (IN) / ap-south-2
0.1089 USD/h 1.0893 USD/h
Mumbai (IN) / ap-south-1
0.290933 USD/h 1.0893 USD/h
Stockholm (SE) / eu-north-1
0.13975 USD/h 1.1228 USD/h
Quebec (CA) / ca-central-1
0.638767 USD/h 1.1563 USD/h
Calgary (CA) / ca-west-1
0.29775 USD/h 1.1563 USD/h
California (US) / us-west-1
0.2517 USD/h 1.173 USD/h
Aragón (ES) / eu-south-2
0.363 USD/h 1.1814 USD/h
Dublin (IE) / eu-west-1
0.507867 USD/h 1.1814 USD/h
Milan (IT) / eu-south-1
0.308867 USD/h 1.2401 USD/h
London (GB) / eu-west-2
0.3389 USD/h 1.2401 USD/h
Paris (FR) / eu-west-3
0.394667 USD/h 1.2401 USD/h
Sydney (AU) / ap-southeast-2
0.4051 USD/h 1.2653 USD/h
Seoul (KR) / ap-northeast-2
0.317925 USD/h 1.2736 USD/h
Tokyo (JP) / ap-northeast-1
0.428833 USD/h 1.2736 USD/h
Frankfurt (DE) / eu-central-1
0.4546 USD/h 1.2736 USD/h
Singapore (SG) / ap-southeast-1
0.521433 USD/h 1.2736 USD/h
(NZ) / ap-southeast-6
0.4058 USD/h 1.3285 USD/h
Zurich (CH) / eu-central-2
0.698933 USD/h 1.401 USD/h
Cape Town (ZA) / af-south-1
0.3653 USD/h 1.4077 USD/h
Sao Paulo (BR) / sa-east-1
0.237467 USD/h 1.6842 USD/h

Processor

vCPUs
16
Hypervisor
nitro
CPU Allocation
Dedicated
CPU Cores
8
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
384 KiB
CPU L1I Cache
64 KiB
CPU L1I Cache Total
512 KiB
CPU L2 Cache
2 MiB
CPU L2 Cache Total
16 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
8.1
Scalability
50.62

System Resources and Accelerators

MEMORY
Memory Amount
128 GiB
Memory Amount Actual
128 GiB
Memory Generation
DDR5
Memory Speed
7200 Mhz
ACCELERATORS
Accelerator Count
0
Accelerator Memory Min
0 MiB
Accelerator Memory Total
0 MiB
Accelerators
    STORAGE
    Storage Size
    0 GB
    Storages
      NETWORK
      Network Speed Baseline
      3.75 Gbps
      Network Speed Max
      15 Gbps
      Network Storage Speed Baseline
      2.5 Gbps
      Network Storage Speed Max
      10 Gbps
      Inbound Traffic
      0 GB/month
      Outbound Traffic
      0 GB/month
      IPv4
      0

      Server Description

      A memory-optimized x86 server featuring DDR5 memory and advanced matrix extensions for memory-intensive workloads and text processing.

      Memory Optimized

      The Amazon Web Services r8i-flex.4xlarge is a memory-optimized instance featuring 16 vCPUs and 8 physical cores powered by an Intel Xeon 6975P-C processor running at 3.9 GHz. It is configured with 128.0 GB of DDR5 memory at 7 GHz, yielding 8.0 GB of RAM per core, but lacks local storage and dedicated GPUs. Operating on the Nitro hypervisor, the instance supports advanced instruction sets like AVX-512 and Intel AMX. In benchmark evaluations, it demonstrates top-tier performance in text processing and small-model LLM text generation, alongside strong single-core processing. Conversely, its multi-core metrics, database operations, and memory bandwidth fall into the average tier. Lacking local storage, it relies on network storage, making it suitable for memory-intensive applications, text processing, and caching databases.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      1.6Score
      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) 3,556,839 ops/sec 1,918,343 ops/sec 1.9 50.00% 50.00% +38.00%
      Redis RPS (pipeline=16, SET) 19,694,901 ops/sec 11,704,734 ops/sec 1.7 20.00% 20.00% +11.00%
      PassMark Memory Mark (composite) 2,342 2,416 0.96 10.00% 10.00% -0.41%
      Memory bandwidth (read, 16 MB ~ L3) 161,412 MB/sec 108,420 MB/sec 1.5 10.00% 10.00% +4.10%
      PassMark single-thread CPU 3,275 Mops/s 2,365 Mops/s 1.4 10.00% 10.00% +3.40%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 2,161

      Geekbench Multi-Core

      Score: 13,164

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 29,208
      Compression
      		 319,767
      Encryption
      		 18,186
      Extended Instructions
      		 22,962
      Floating Point Maths
      		 59,873
      Integer Maths
      		 82,719
      Physics
      		 3,811
      Prime Numbers
      		 177
      Single Threaded
      		 3,275
      String Sorting
      		 42,366

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2,342
      Database Operations
      		 8,781
      Memory Latency
      		 74
      Memory Read Cached
      		 28,724
      Memory Read Uncached
      		 10,354
      Memory Write
      		 11,350

      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

      INSTANCEvCPUsMEMORYAccelerators
      r8i-flex.large 216 GiB0
      r8i-flex.xlarge 432 GiB0
      r8i-flex.2xlarge 864 GiB0
      r8i-flex.8xlarge 32256 GiB0
      r8i-flex.12xlarge 48384 GiB0
      r8i-flex.16xlarge 64512 GiB0

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      r8i-flex.4xlarge FAQs