c8a.4xlarge by Amazon Web Services

c8a.4xlarge is a Compute optimized [AMD processors] Gen8 4xlarge server offered by Amazon Web Services with 16 vCPUs, 32 GiB of memory and 0 GB of storage. The pricing starts at 0.0925 USD per hour.
16 vCPU
32 GiB Memory
Spare SCore
59,719
(All-cores)
3,777
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
c8a.4xlarge
Description
Compute optimized [AMD processors] Gen8 4xlarge
Family
c8a
Hw Virt
Average Time To Start
6.8
Status
active
Observed At
2026-10-29T13:43:57.550204

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
0.279067 USD/h 0.8622 USD/h
Northern Virgina (US) / us-east-1
0.3347 USD/h 0.8622 USD/h
Oregon (US) / us-west-2
0.3691 USD/h 0.8622 USD/h
Aragón (ES) / eu-south-2
0.094733 USD/h 0.9249 USD/h
Dublin (IE) / eu-west-1
0.38915 USD/h 0.925 USD/h
Frankfurt (DE) / eu-central-1
0.364933 USD/h 0.9839 USD/h
Tokyo (JP) / ap-northeast-1
0.419567 USD/h 1.0853 USD/h

Processor

vCPUs
16
Hypervisor
nitro
CPU Allocation
Dedicated
CPU Cores
16
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
768 KiB
CPU L1I Cache
32 KiB
CPU L1I Cache Total
512 KiB
CPU L2 Cache
1 MiB
CPU L2 Cache Total
16 MiB
CPU L3 Cache
32 MiB
CPU L3 Cache Total
64 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
15.8
Scalability
98.75

System Resources and Accelerators

MEMORY
Memory Amount
32 GiB
Memory Amount Actual
32 GiB
Memory Generation
DDR5
Memory Speed
6400 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
      7.5 Gbps
      Network Speed Max
      15 Gbps
      Network Storage Speed Baseline
      5 Gbps
      Network Storage Speed Max
      10 Gbps
      Inbound Traffic
      0 GB/month
      Outbound Traffic
      0 GB/month
      IPv4
      0

      CPU and System Topology

      Server Description

      A dedicated 16-core AMD EPYC compute instance with high-speed DDR5 memory, optimized for single-threaded execution and vector-intensive workloads.

      Compute OptimizedGeneral Purpose

      Amazon Web Services c8a.4xlarge is a compute-optimized instance featuring an x86_64 AMD EPYC 9R45 processor with 16 dedicated physical cores running at 4.5 GHz. Built on the Nitro hypervisor, it includes 32.0 GB of DDR5 memory at 6 GHz, providing 2.0 GB of RAM per core. The instance lacks local storage and GPU accelerators, relying on an 8 Gbps baseline network bandwidth. Benchmarks highlight top-tier single-core CPU performance, single-threaded compression, and text processing, alongside strong static web serving throughput. Its hardware profile makes it highly efficient for compute-bound workloads that benefit from high clock speeds and advanced vector instructions (AVX-512) without requiring massive memory allocations. Recommended workloads include web serving, image processing, text processing, and small-scale language model inference.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      2.4Score
      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) 5,892,940 ops/sec 1,919,289 ops/sec 3.1 50.00% 50.00% +76.00%
      Redis RPS (pipeline=16, SET) 39,716,563 ops/sec 11,728,058 ops/sec 3.3 20.00% 20.00% +27.00%
      PassMark Memory Mark (composite) 2,741 2,416 1.1 10.00% 10.00% +0.96%
      Memory bandwidth (read, 16 MB ~ L3) 127,735 MB/sec 108,466 MB/sec 1.2 10.00% 10.00% +1.80%
      PassMark single-thread CPU 3,827 Mops/s 2,365 Mops/s 1.6 10.00% 10.00% +4.80%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 2,807

      Geekbench Multi-Core

      Score: 21,584

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 47,007
      Compression
      		 528,098
      Encryption
      		 25,293
      Extended Instructions
      		 49,548
      Floating Point Maths
      		 121,549
      Integer Maths
      		 121,784
      Physics
      		 6,072
      Prime Numbers
      		 445
      Single Threaded
      		 3,827
      String Sorting
      		 73,761

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2,741
      Database Operations
      		 20,831
      Memory Latency
      		 82
      Memory Read Cached
      		 33,959
      Memory Read Uncached
      		 32,545
      Memory Write
      		 32,566

      Stress-ng Stressors

      CPU integerSingleMultiScaling
      atomic
      		 376 360.12 0.96×
      bitops
      		 232,565 3,666,354 15.76×
      branch
      		 184,636 2,930,110 15.87×
      funccall
      		 908.25 14,277 15.72×
      funcret
      		 26,804 435,689 16.25×
      hash
      		 218,037 3,452,627 15.84×
      intmath
      		 80,176 1,270,967 15.85×
      nop
      		 432,807 6,826,414 15.77×
      prime
      		 632,128 9,779,137 15.47×
      rotate
      		 142,609 2,257,073 15.83×
      str
      		 1,656,214 24,906,927 15.04×
      wcs
      		 1,019,091 17,149,015 16.83×
      CryptographySingleMultiScaling
      crypt
      		 5,452 85,968 15.77×
      CompressionSingleMultiScaling
      jpeg
      		 1,248 19,675 15.76×
      zlib
      		 66.94 1,203 17.97×
      HypervisorSingleMultiScaling
      clock
      		 51,561 354,103 6.87×
      clone
      		 394.43 3,800 9.63×
      context
      		 9,240 145,485 15.74×
      cpu-sched
      		 60.24 1,043 17.32×
      eventfd
      		 234,756 4,206,941 17.92×
      fault
      		 45,263 319,570 7.06×
      fork
      		 6,985 81,377 11.65×
      getrandom
      		 100,609 1,580,240 15.71×
      hrtimers
      		 507,406 2,348,917 4.63×
      mprotect
      		 977,610 10,936,559 11.19×
      mtx
      		 43,783,281 1,370,957,454 31.31×
      munmap
      		 5,781 69,867 12.08×
      null
      		 1,541,115 24,469,050 15.88×
      pipe
      		 3,114,647 19,518,129 6.27×
      priv-instr
      		 1,612,639 19,647,586 12.18×
      resched
      		 16,530,197 6,589,624 0.40×
      switch
      		 368,321 10,528,778 28.59×
      timermix
      		 513,754 8,013,338 15.60×
      tlb-shootdown
      		 18,936 119,316 6.30×
      tsc
      		 891,010 14,146,321 15.88×
      usersyscall
      		 1,148,129 15,062,888 13.12×
      vdso
      		 108,725,360 1,718,641,176 15.81×
      vfork
      		 42,790 321,422 7.51×
      x86syscall
      		 20,227,343 316,674,936 15.66×
      yield
      		 36,291,300 33,707,406 0.93×
      zero
      		 10,362,852 166,322,807 16.05×
      CPU float/SIMDSingleMultiScaling
      eigen
      		 17,618 277,034 15.72×
      expmath
      		 4,027 63,544 15.78×
      fma
      		 1,569,691 24,607,548 15.68×
      fp
      		 195.93 3,338 17.04×
      fractal
      		 9 138.46 15.38×
      hyperbolic
      		 5,490 86,257 15.71×
      logmath
      		 5,739 90,524 15.77×
      matrix
      		 9,356 142,707 15.25×
      matrix-3d
      		 1,592 5,880 3.69×
      monte-carlo
      		 464.1 7,351 15.84×
      mpfr
      		 2,431 38,434 15.81×
      powmath
      		 1,851 29,208 15.78×
      trig
      		 2,442 38,708 15.85×
      veccmp
      		 30,249 476,987 15.77×
      vecfp
      		 2,411 38,196 15.84×
      vecmath
      		 4,765 75,054 15.75×
      vecshuf
      		 1,007 15,873 15.77×
      vecwide
      		 40,432 638,388 15.79×
      AlgorithmsSingleMultiScaling
      bitonicsort
      		 13 202.99 15.61×
      bsearch
      		 368.32 5,821 15.80×
      bubblesort
      		 1.2 19.2 16.00×
      fibsearch
      		 432.05 6,833 15.82×
      heapsort
      		 14.4 225.8 15.68×
      hsearch
      		 13,502 211,371 15.65×
      insertionsort
      		 9.6 173 18.02×
      malloc
      		 5,403,149 57,787,714 10.70×
      mcontend
      		 146.9 3,139 21.37×
      mergesort
      		 39.6 624.59 15.77×
      qsort
      		 27.2 426.59 15.68×
      skiplist
      		 8,504 133,244 15.67×
      tree
      		 2.6 26.2 10.08×
      MemorySingleMultiScaling
      cache
      		 1,163,875 1,902,676 1.63×
      cachehammer
      		 270,046 4,366,456 16.17×
      cacheline
      		 67.52 1,261 18.67×
      l1cache
      		 1,380 21,596 15.65×
      memcpy
      		 808.49 12,787 15.82×
      memrate
      		 0.99 9.21 9.30×
      memthrash
      		 234.84 950.95 4.05×
      ptr-chase
      		 77,472,951 156,885,352 2.03×
      spinmem
      		 295.59 1,121 3.79×
      stream
      		 162.03 8,370 51.66×
      vm
      		 241,772 293,933 1.22×

      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

      PostgreSQL heavy read-only throughput

      Alternatives

      Servers of the Same Family

      INSTANCEvCPUsMEMORYAccelerators
      c8a.medium 12 GiB0
      c8a.large 24 GiB0
      c8a.xlarge 48 GiB0
      c8a.2xlarge 816 GiB0
      c8a.8xlarge 3264 GiB0
      c8a.12xlarge 4896 GiB0
      c8a.16xlarge 64128 GiB0

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      c8a.4xlarge FAQs