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c8i-flex.16xlarge by Amazon Web Services

c8i-flex.16xlarge is a Compute optimized [Intel processors] Gen8 16xlarge server offered by Amazon Web Services with 64 vCPUs, 128 GiB of memory and 0 GB of storage. The pricing starts at 0.4447 USD per hour.
64 vCPU
128 GiB Memory
Spare SCore
69316
(All-cores)
2134
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
c8i-flex.16xlarge
Description
Compute optimized [Intel processors] Gen8 16xlarge
Family
c8i-flex
Hw Virt
Status
active
Observed At
2026-07-30T14:54:09.583565

Availability

REGION / IDSPOTONDEMAND
(MY) / ap-southeast-5
1.045433 USD/h 2.792 USD/h
Mumbai (IN) / ap-south-1
1.102133 USD/h 2.8486 USD/h
Northern Virgina (US) / us-east-1
1.097325 USD/h 2.8486 USD/h
Hyderabad (IN) / ap-south-2
0.922867 USD/h 2.8486 USD/h
Oregon (US) / us-west-2
1.126525 USD/h 2.8486 USD/h
Ohio (US) / us-east-2
0.9631 USD/h 2.8486 USD/h
Aragón (ES) / eu-south-2
0.948867 USD/h 3.0563 USD/h
Dublin (IE) / eu-west-1
2.253 USD/h 3.0566 USD/h
Quebec (CA) / ca-central-1
1.796667 USD/h 3.1168 USD/h
Seoul (KR) / ap-northeast-2
0.762 USD/h 3.2176 USD/h
Frankfurt (DE) / eu-central-1
1.6101 USD/h 3.2509 USD/h
Singapore (SG) / ap-southeast-1
1.971333 USD/h 3.2848 USD/h
London (GB) / eu-west-2
1.856467 USD/h 3.385 USD/h
Paris (FR) / eu-west-3
1.2356 USD/h 3.385 USD/h
California (US) / us-west-1
1.43735 USD/h 3.5526 USD/h
Tokyo (JP) / ap-northeast-1
1.765267 USD/h 3.5862 USD/h
Sydney (AU) / ap-southeast-2
1.421133 USD/h 3.7203 USD/h
Cape Town (ZA) / af-south-1
0.805267 USD/h 3.8208 USD/h
(NZ) / ap-southeast-6
1.515533 USD/h 3.9062 USD/h
Sao Paulo (BR) / sa-east-1
2.92875 USD/h 4.3907 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
128 GiB
Memory Amount Actual
128 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 high-density, compute-optimized x86_64 platform featuring 64 vCPUs and DDR5 memory for demanding compilation, web serving, and inference workloads.

      Compute Optimized

      Amazon Web Services c8i-flex.16xlarge is a compute-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 x86_64 architecture and the Nitro hypervisor, it includes 128.0 GB of DDR5 memory at 7 GHz, providing 2.0 GB of RAM per core. The instance lacks local storage and GPUs, relying on network-attached storage and offering a baseline network bandwidth of 15 Gbps. Benchmark data highlights top-tier performance in software compilation, image processing, and static web serving, alongside strong multi-core CPU capabilities and memory read bandwidth. With advanced instruction sets like AVX-512 and Intel AMX, this instance is highly efficient for compute-heavy workloads, including medium-scale LLM inference, multi-threaded decompression, and high-throughput web serving, offering a balanced trade-off between high compute density and memory capacity.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      4.46Score
      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) 13,947,419 ops/sec 1,896,415 ops/sec 7.35 50.00% 50.00% +171.00%
      Redis RPS (pipeline=16, SET) 77,911,006 ops/sec 11,539,523 ops/sec 6.75 20.00% 20.00% +46.50%
      PassMark Memory Mark (composite) 2,569 2,411 1.07 10.00% 10.00% +0.68%
      Memory bandwidth (read, 16 MB ~ L3) 230,158 MB/sec 107,368 MB/sec 2.14 10.00% 10.00% +7.90%
      PassMark single-thread CPU 3,281 Mops/s 2,363 Mops/s 1.39 10.00% 10.00% +3.35%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 2,200

      Geekbench Multi-Core

      Score: 20,959

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 83206
      Compression
      		 1272706
      Encryption
      		 72824
      Extended Instructions
      		 88635
      Floating Point Maths
      		 239457
      Integer Maths
      		 330621
      Physics
      		 9466
      Prime Numbers
      		 544
      Single Threaded
      		 3281
      String Sorting
      		 164039

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2569
      Database Operations
      		 29708
      Memory Latency
      		 66
      Memory Read Cached
      		 28278
      Memory Read Uncached
      		 11138
      Memory Write
      		 11592

      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
      c8i-flex.large 24 GiB0
      c8i-flex.xlarge 48 GiB0
      c8i-flex.2xlarge 816 GiB0
      c8i-flex.4xlarge 1632 GiB0
      c8i-flex.8xlarge 3264 GiB0
      c8i-flex.12xlarge 4896 GiB0

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      c8i-flex.16xlarge FAQs