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
69,310
(All-cores)
2,131
(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
2026-09-14T21:57:16.507218

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
1.0439 USD/h 4.223 USD/h
Northern Virgina (US) / us-east-1
1.61668 USD/h 4.223 USD/h
Oregon (US) / us-west-2
1.7201 USD/h 4.223 USD/h
(MY) / ap-southeast-5
1.360233 USD/h 4.3302 USD/h
Mumbai (IN) / ap-south-1
1.0375 USD/h 4.3571 USD/h
Hyderabad (IN) / ap-south-2
0.978467 USD/h 4.3571 USD/h
Stockholm (SE) / eu-north-1
0.86865 USD/h 4.4912 USD/h
Calgary (CA) / ca-west-1
2.81065 USD/h 4.6253 USD/h
Quebec (CA) / ca-central-1
2.330267 USD/h 4.6253 USD/h
California (US) / us-west-1
3.03365 USD/h 4.6922 USD/h
Aragón (ES) / eu-south-2
0.588067 USD/h 4.7258 USD/h
Dublin (IE) / eu-west-1
2.0494 USD/h 4.7258 USD/h
Milan (IT) / eu-south-1
1.126967 USD/h 4.9603 USD/h
Paris (FR) / eu-west-3
3.145267 USD/h 4.9603 USD/h
London (GB) / eu-west-2
2.3701 USD/h 4.9603 USD/h
Sydney (AU) / ap-southeast-2
2.422267 USD/h 5.0611 USD/h
Seoul (KR) / ap-northeast-2
1.309425 USD/h 5.0944 USD/h
Singapore (SG) / ap-southeast-1
2.304167 USD/h 5.0944 USD/h
Tokyo (JP) / ap-northeast-1
2.286933 USD/h 5.0944 USD/h
Frankfurt (DE) / eu-central-1
2.371667 USD/h 5.0944 USD/h
(NZ) / ap-southeast-6
1.8857 USD/h 5.3139 USD/h
Zurich (CH) / eu-central-2
2.416633 USD/h 5.6038 USD/h
Cape Town (ZA) / af-south-1
1.672767 USD/h 5.6307 USD/h
Sao Paulo (BR) / sa-east-1
2.819133 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 x86 server featuring high-speed DDR5 RAM and advanced Intel matrix extensions for demanding database and compute workloads.

      Memory OptimizedCompute Optimized

      Amazon Web Services r8i-flex.16xlarge is a memory-optimized instance featuring 64 vCPUs and 32 physical cores powered by an Intel Xeon 6975P-C processor running at 3.9 GHz. Built on the Nitro hypervisor, it includes 512.0 GB of high-speed DDR5 memory, yielding 8.0 GB of RAM per core, but lacks local storage and GPU accelerators. The processor supports advanced instruction sets such as Intel AMX and AVX-512, which drive strong multi-core performance and top-tier results in software compilation, image processing, and static web serving. Benchmark data highlights strong memory read bandwidth and database performance. This instance is optimized for memory-intensive workloads, including large databases, Redis deployments, and CPU-based machine learning inference.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      4.38Score
      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 1,917,397 ops/sec 7.24 50.00% 50.00% +169.00%
      Redis RPS (pipeline=16, SET) 77,699,028 ops/sec 11,681,410 ops/sec 6.65 20.00% 20.00% +46.10%
      PassMark Memory Mark (composite) 2,470 2,418 1.02 10.00% 10.00% +0.20%
      Memory bandwidth (read, 16 MB ~ L3) 225,982 MB/sec 108,140 MB/sec 2.09 10.00% 10.00% +7.65%
      PassMark single-thread CPU 3,280 Mops/s 2,365 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