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 0.1216 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
2026-09-14T08:41:15.249817

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
0.273333 USD/h 0.8622 USD/h
Oregon (US) / us-west-2
0.3636 USD/h 0.8622 USD/h
Northern Virgina (US) / us-east-1
0.35518 USD/h 0.8622 USD/h
Aragón (ES) / eu-south-2
0.1296 USD/h 0.9249 USD/h
Dublin (IE) / eu-west-1
0.51555 USD/h 0.925 USD/h
Frankfurt (DE) / eu-central-1
0.344567 USD/h 0.9839 USD/h
Tokyo (JP) / ap-northeast-1
0.349067 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
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
      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

      2.42Score
      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 1,917,397 ops/sec 3.07 50.00% 50.00% +75.20%
      Redis RPS (pipeline=16, SET) 39,716,563 ops/sec 11,681,410 ops/sec 3.4 20.00% 20.00% +27.70%
      PassMark Memory Mark (composite) 2,741 2,418 1.13 10.00% 10.00% +1.23%
      Memory bandwidth (read, 16 MB ~ L3) 127,735 MB/sec 108,140 MB/sec 1.18 10.00% 10.00% +1.67%
      PassMark single-thread CPU 3,827 Mops/s 2,365 Mops/s 1.62 10.00% 10.00% +4.94%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 2,807

      Geekbench Multi-Core

      Score: 21,584

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 47007
      Compression
      		 528098
      Encryption
      		 25293
      Extended Instructions
      		 49548
      Floating Point Maths
      		 121549
      Integer Maths
      		 121784
      Physics
      		 6072
      Prime Numbers
      		 445
      Single Threaded
      		 3827
      String Sorting
      		 73761

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2741
      Database Operations
      		 20831
      Memory Latency
      		 82
      Memory Read Cached
      		 33959
      Memory Read Uncached
      		 32545
      Memory Write
      		 32566

      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

      INSTANCEvCPUsMEMORYGPUs
      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