c8a.8xlarge by Amazon Web Services

c8a.8xlarge is a Compute optimized [AMD processors] Gen8 8xlarge server offered by Amazon Web Services with 32 vCPUs, 64 GiB of memory and 0 GB of storage. The pricing starts at 0.185 USD per hour.
32 vCPU
64 GiB Memory
Spare SCore
120,279
(All-cores)
3,774
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
c8a.8xlarge
Description
Compute optimized [AMD processors] Gen8 8xlarge
Family
c8a
Hw Virt
Average Time To Start
7
Status
active
Observed At
2026-10-29T13:43:57.551481

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
0.5607 USD/h 1.7243 USD/h
Oregon (US) / us-west-2
0.73965 USD/h 1.7243 USD/h
Northern Virgina (US) / us-east-1
0.78632 USD/h 1.7243 USD/h
Aragón (ES) / eu-south-2
0.199767 USD/h 1.8498 USD/h
Dublin (IE) / eu-west-1
0.8704 USD/h 1.8501 USD/h
Frankfurt (DE) / eu-central-1
0.710367 USD/h 1.9678 USD/h
Tokyo (JP) / ap-northeast-1
0.761067 USD/h 2.1706 USD/h

Processor

vCPUs
32
Hypervisor
nitro
CPU Allocation
Dedicated
CPU Cores
32
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
2 MiB
CPU L1I Cache
32 KiB
CPU L1I Cache Total
1 MiB
CPU L2 Cache
1 MiB
CPU L2 Cache Total
32 MiB
CPU L3 Cache
32 MiB
CPU L3 Cache Total
128 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
31.9
Scalability
99.69

System Resources and Accelerators

MEMORY
Memory Amount
64 GiB
Memory Amount Actual
64 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
      15 Gbps
      Network Speed Max
      15 Gbps
      Network Storage Speed Baseline
      10 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 high-frequency, compute-optimized instance featuring dedicated AMD EPYC cores and DDR5 memory for high-throughput, CPU-bound workloads.

      Compute OptimizedGeneral Purpose

      Amazon Web Services c8a.8xlarge is a compute-optimized instance featuring 32 dedicated physical cores powered by an AMD EPYC 9R45 processor running at 4.5 GHz. Built on the x86_64 architecture and managed by the Nitro hypervisor, it includes 64.0 GB of DDR5 memory at 6 GHz but lacks local storage and GPU accelerators. The instance delivers top-tier performance, ranking in the top 10% for single-core stress-ng, Geekbench, and database operations, alongside strong top 25% multi-core and memory bandwidth capabilities. With a 2.0 GB memory-per-core ratio, it represents a high-density compute profile optimized for CPU-bound workloads. It is highly suited for software compilation, web serving, database tasks, and medium-scale LLM inference.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      4.2Score
      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) 11,865,395 ops/sec 1,919,289 ops/sec 6.3 50.00% 50.00% +150.00%
      Redis RPS (pipeline=16, SET) 78,728,018 ops/sec 11,728,058 ops/sec 6.6 20.00% 20.00% +46.00%
      PassMark Memory Mark (composite) 2,830 2,416 1.2 10.00% 10.00% +1.80%
      Memory bandwidth (read, 16 MB ~ L3) 253,035 MB/sec 108,466 MB/sec 2.3 10.00% 10.00% +8.70%
      PassMark single-thread CPU 3,828 Mops/s 2,365 Mops/s 1.6 10.00% 10.00% +4.80%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 2,631

      Geekbench Multi-Core

      Score: 24,632

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 80,094
      Compression
      		 1,056,892
      Encryption
      		 50,642
      Extended Instructions
      		 96,811
      Floating Point Maths
      		 243,309
      Integer Maths
      		 243,621
      Physics
      		 11,697
      Prime Numbers
      		 888
      Single Threaded
      		 3,828
      String Sorting
      		 144,046

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2,830
      Database Operations
      		 41,207
      Memory Latency
      		 83
      Memory Read Cached
      		 33,847
      Memory Read Uncached
      		 32,663
      Memory Write
      		 32,783

      Stress-ng Stressors

      CPU integerSingleMultiScaling
      atomic
      		 524.14 345.9 0.66×
      bitops
      		 230,983 7,238,179 31.34×
      branch
      		 184,383 5,821,697 31.57×
      funccall
      		 905.62 28,266 31.21×
      funcret
      		 27,863 840,520 30.17×
      hash
      		 218,383 6,863,389 31.43×
      intmath
      		 80,199 2,542,406 31.70×
      nop
      		 430,992 13,691,930 31.77×
      prime
      		 621,903 19,579,550 31.48×
      rotate
      		 142,506 4,494,676 31.54×
      str
      		 1,653,653 50,436,639 30.50×
      wcs
      		 1,053,402 31,171,992 29.59×
      CryptographySingleMultiScaling
      crypt
      		 5,431 160,704 29.59×
      CompressionSingleMultiScaling
      jpeg
      		 1,279 39,903 31.20×
      zlib
      		 83.74 2,431 29.03×
      HypervisorSingleMultiScaling
      clock
      		 49,889 379,965 7.62×
      clone
      		 285.03 8,524 29.90×
      context
      		 9,165 288,907 31.52×
      cpu-sched
      		 60.23 2,052 34.06×
      eventfd
      		 155,890 6,863,914 44.03×
      fault
      		 44,625 259,992 5.83×
      fork
      		 6,713 120,251 17.91×
      getrandom
      		 100,608 3,142,038 31.23×
      hrtimers
      		 141,608 2,802,513 19.79×
      mprotect
      		 761,712 17,674,325 23.20×
      mtx
      		 42,772,123 2,675,318,400 62.55×
      munmap
      		 5,621 106,106 18.88×
      null
      		 1,524,892 48,207,654 31.61×
      pipe
      		 3,189,641 33,523,967 10.51×
      priv-instr
      		 1,603,478 22,903,253 14.28×
      resched
      		 18,177,860 11,014,992 0.61×
      switch
      		 363,826 20,776,581 57.11×
      timermix
      		 515,353 15,983,926 31.02×
      tlb-shootdown
      		 18,592 214,275 11.52×
      tsc
      		 891,043 28,071,179 31.50×
      usersyscall
      		 1,152,389 21,378,732 18.55×
      vdso
      		 108,746,736 3,405,289,498 31.31×
      vfork
      		 42,894 265,839 6.20×
      x86syscall
      		 20,252,749 627,351,855 30.98×
      yield
      		 62,006,033 65,741,282 1.06×
      zero
      		 10,620,185 333,352,219 31.39×
      CPU float/SIMDSingleMultiScaling
      eigen
      		 17,577 530,960 30.21×
      expmath
      		 4,027 124,731 30.97×
      fma
      		 1,569,481 48,584,969 30.96×
      fp
      		 211.18 6,383 30.23×
      fractal
      		 9 275.71 30.63×
      hyperbolic
      		 5,472 171,596 31.36×
      logmath
      		 5,729 179,218 31.28×
      matrix
      		 9,075 269,473 29.69×
      matrix-3d
      		 1,577 10,480 6.64×
      monte-carlo
      		 464.22 14,696 31.66×
      mpfr
      		 2,422 75,539 31.18×
      powmath
      		 1,853 58,017 31.30×
      trig
      		 2,453 76,928 31.36×
      veccmp
      		 30,248 943,751 31.20×
      vecfp
      		 2,427 75,792 31.23×
      vecmath
      		 4,753 148,966 31.34×
      vecshuf
      		 1,004 31,465 31.34×
      vecwide
      		 40,345 1,248,522 30.95×
      AlgorithmsSingleMultiScaling
      bitonicsort
      		 13 403.99 31.08×
      bsearch
      		 366.37 11,563 31.56×
      bubblesort
      		 1.2 38.2 31.83×
      fibsearch
      		 432.32 13,559 31.36×
      heapsort
      		 14.4 448.79 31.17×
      hsearch
      		 13,366 418,877 31.34×
      insertionsort
      		 9.6 329.21 34.29×
      malloc
      		 5,378,033 79,179,789 14.72×
      mcontend
      		 130.05 5,879 45.21×
      mergesort
      		 39.6 1,225 30.94×
      qsort
      		 27 844.42 31.27×
      skiplist
      		 8,522 266,441 31.26×
      tree
      		 2.6 51.57 19.83×
      MemorySingleMultiScaling
      cache
      		 1,168,370 1,818,868 1.56×
      cachehammer
      		 268,685 8,383,560 31.20×
      cacheline
      		 67.37 2,549 37.84×
      l1cache
      		 1,378 42,929 31.16×
      memcpy
      		 808.85 25,392 31.39×
      memrate
      		 0.99 17.05 17.22×
      memthrash
      		 231.41 1,738 7.51×
      ptr-chase
      		 79,408,085 309,036,511 3.89×
      spinmem
      		 299.79 2,240 7.47×
      stream
      		 160.82 32,090 199.54×
      vm
      		 241,824 296,359 1.23×

      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.4xlarge 1632 GiB0
      c8a.12xlarge 4896 GiB0
      c8a.16xlarge 64128 GiB0

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      c8a.8xlarge FAQs