c8a.16xlarge by Amazon Web Services

c8a.16xlarge is a Compute optimized [AMD 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 0.4228 USD per hour.
64 vCPU
128 GiB Memory
Spare SCore
238,556
(All-cores)
3,753
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
c8a.16xlarge
Description
Compute optimized [AMD processors] Gen8 16xlarge
Family
c8a
Hw Virt
Average Time To Start
6.33
Status
active
Observed At
2026-10-29T21:42:29.835831

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
1.102133 USD/h 3.4486 USD/h
Northern Virgina (US) / us-east-1
1.1461 USD/h 3.4486 USD/h
Oregon (US) / us-west-2
1.34745 USD/h 3.4486 USD/h
Aragón (ES) / eu-south-2
0.709867 USD/h 3.6995 USD/h
Dublin (IE) / eu-west-1
1.7168 USD/h 3.7002 USD/h
Frankfurt (DE) / eu-central-1
1.3939 USD/h 3.9357 USD/h
Tokyo (JP) / ap-northeast-1
1.368267 USD/h 4.3411 USD/h

Processor

vCPUs
64
Hypervisor
nitro
CPU Allocation
Dedicated
CPU Cores
64
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
3 MiB
CPU L1I Cache
32 KiB
CPU L1I Cache Total
2 MiB
CPU L2 Cache
1 MiB
CPU L2 Cache Total
64 MiB
CPU L3 Cache
32 MiB
CPU L3 Cache Total
256 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
63.6
Scalability
99.38

System Resources and Accelerators

MEMORY
Memory Amount
128 GiB
Memory Amount Actual
128 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
      30 Gbps
      Network Speed Max
      30 Gbps
      Network Storage Speed Baseline
      20 Gbps
      Network Storage Speed Max
      20 Gbps
      Inbound Traffic
      0 GB/month
      Outbound Traffic
      0 GB/month
      IPv4
      0

      CPU and System Topology

      Server Description

      A high-frequency, compute-dense server featuring dedicated AMD EPYC processors and DDR5 memory for demanding CPU-bound workloads.

      Compute Optimized

      Amazon Web Services c8a.16xlarge is a compute-optimized instance featuring 64 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 128.0 GB of DDR5 memory at 6 GHz, providing 2.0 GB of RAM per core. The instance lacks local storage and dedicated GPUs, relying instead on network-attached storage and a 30 Gbps baseline network interface. Benchmark data indicates top-tier performance in single-core and multi-core CPU execution, memory bandwidth, and cryptographic operations. It excels in compute-heavy tasks such as software compilation, static web serving, database operations, and CPU-based LLM inference. This hardware profile offers high qualitative cost efficiency for workloads requiring dense, high-frequency processing power without the overhead of excess memory or local storage.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      6.6Score
      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) 20,599,668 ops/sec 1,919,289 ops/sec 11 50.00% 50.00% +230.00%
      Redis RPS (pipeline=16, SET) 130,981,300 ops/sec 11,728,058 ops/sec 11 20.00% 20.00% +62.00%
      PassMark Memory Mark (composite) 2,846 2,416 1.2 10.00% 10.00% +1.80%
      Memory bandwidth (read, 16 MB ~ L3) 502,895 MB/sec 108,466 MB/sec 4.5 10.00% 10.00% +16.00%
      PassMark single-thread CPU 3,819 Mops/s 2,365 Mops/s 1.6 10.00% 10.00% +4.80%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 2,825

      Geekbench Multi-Core

      Score: 30,892

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 118,499
      Compression
      		 1,830,213
      Encryption
      		 99,027
      Extended Instructions
      		 158,773
      Floating Point Maths
      		 475,378
      Integer Maths
      		 483,770
      Physics
      		 21,606
      Prime Numbers
      		 1,612
      Single Threaded
      		 3,819
      String Sorting
      		 249,758

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2,846
      Database Operations
      		 40,624
      Memory Latency
      		 85
      Memory Read Cached
      		 33,854
      Memory Read Uncached
      		 32,481
      Memory Write
      		 32,641

      Stress-ng Stressors

      CPU integerSingleMultiScaling
      atomic
      		 530.21 331.83 0.63×
      bitops
      		 232,070 13,549,838 58.39×
      branch
      		 184,991 11,201,816 60.55×
      funccall
      		 907.15 51,396 56.66×
      funcret
      		 27,025 1,516,724 56.12×
      hash
      		 218,656 13,363,793 61.12×
      intmath
      		 79,848 4,985,756 62.44×
      nop
      		 433,058 26,894,769 62.10×
      prime
      		 621,766 33,511,955 53.90×
      rotate
      		 142,643 8,870,769 62.19×
      str
      		 1,662,605 78,002,178 46.92×
      wcs
      		 1,047,917 53,521,580 51.07×
      CryptographySingleMultiScaling
      crypt
      		 5,386 285,646 53.03×
      CompressionSingleMultiScaling
      jpeg
      		 1,281 64,183 50.09×
      zlib
      		 89.72 4,333 48.29×
      HypervisorSingleMultiScaling
      clock
      		 47,724 348,243 7.30×
      clone
      		 341.95 11,941 34.92×
      context
      		 9,263 556,925 60.12×
      cpu-sched
      		 63.86 4,116 64.45×
      eventfd
      		 149,724 9,158,080 61.17×
      fault
      		 44,566 217,309 4.88×
      fork
      		 6,434 128,382 19.95×
      getrandom
      		 100,831 5,606,632 55.60×
      hrtimers
      		 187,717 2,920,440 15.56×
      mprotect
      		 667,960 23,821,825 35.66×
      mtx
      		 42,769,207 4,865,064,417 113.75×
      munmap
      		 5,447 128,700 23.63×
      null
      		 1,551,958 90,816,388 58.52×
      pipe
      		 3,145,637 44,069,370 14.01×
      priv-instr
      		 1,611,568 22,883,322 14.20×
      resched
      		 14,794,868 20,301,332 1.37×
      switch
      		 370,108 37,686,452 101.83×
      timermix
      		 529,498 30,776,124 58.12×
      tlb-shootdown
      		 18,571 377,407 20.32×
      tsc
      		 889,646 56,163,672 63.13×
      usersyscall
      		 1,146,629 22,986,941 20.05×
      vdso
      		 108,906,289 6,690,230,341 61.43×
      vfork
      		 40,065 171,924 4.29×
      x86syscall
      		 20,348,159 1,181,177,406 58.05×
      yield
      		 99,600,828 134,315,181 1.35×
      zero
      		 10,620,985 604,085,253 56.88×
      CPU float/SIMDSingleMultiScaling
      eigen
      		 17,552 1,003,972 57.20×
      expmath
      		 4,009 233,840 58.32×
      fma
      		 1,572,393 87,946,571 55.93×
      fp
      		 220.34 12,395 56.26×
      fractal
      		 9 520.12 57.79×
      hyperbolic
      		 5,482 326,589 59.57×
      logmath
      		 5,725 342,740 59.87×
      matrix
      		 9,308 454,057 48.78×
      matrix-3d
      		 1,527 15,773 10.33×
      monte-carlo
      		 464.09 26,212 56.48×
      mpfr
      		 2,431 131,651 54.15×
      powmath
      		 1,857 112,410 60.52×
      trig
      		 2,446 140,260 57.35×
      veccmp
      		 30,318 1,664,961 54.92×
      vecfp
      		 2,417 139,925 57.89×
      vecmath
      		 4,750 288,168 60.67×
      vecshuf
      		 1,005 56,355 56.06×
      vecwide
      		 40,371 2,129,275 52.74×
      AlgorithmsSingleMultiScaling
      bitonicsort
      		 13 706.2 54.32×
      bsearch
      		 368.39 20,201 54.84×
      bubblesort
      		 1.2 63.8 53.17×
      fibsearch
      		 431.61 23,805 55.15×
      heapsort
      		 14.4 760.78 52.83×
      hsearch
      		 13,498 697,822 51.70×
      insertionsort
      		 9.6 550 57.29×
      malloc
      		 5,421,751 129,843,923 23.95×
      mcontend
      		 112.08 11,572 103.25×
      mergesort
      		 39.6 2,137 53.96×
      qsort
      		 27 1,454 53.86×
      skiplist
      		 8,507 473,481 55.66×
      tree
      		 2.6 102.11 39.27×
      MemorySingleMultiScaling
      cache
      		 1,174,207 2,037,797 1.74×
      cachehammer
      		 276,794 14,471,424 52.28×
      cacheline
      		 63.58 4,414 69.42×
      l1cache
      		 1,375 77,690 56.49×
      memcpy
      		 807.99 46,094 57.05×
      memrate
      		 0.97 24.53 25.29×
      memthrash
      		 265.49 2,847 10.72×
      ptr-chase
      		 77,813,533 600,575,761 7.72×
      spinmem
      		 295.79 4,364 14.75×
      stream
      		 160.39 103,111 642.88×
      vm
      		 240,303 300,699 1.25×

      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.8xlarge 3264 GiB0
      c8a.12xlarge 4896 GiB0

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      c8a.16xlarge FAQs