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c8a.12xlarge by Amazon Web Services

c8a.12xlarge is a Compute optimized [AMD processors] Gen8 12xlarge server offered by Amazon Web Services with 48 vCPUs, 96 GiB of memory and 0 GB of storage. The pricing starts at 0.2775 USD per hour.
48 vCPU
96 GiB Memory
Spare SCore
179310
(All-cores)
3779
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
c8a.12xlarge
Description
Compute optimized [AMD processors] Gen8 12xlarge
Family
c8a
Hw Virt
Status
active
Observed At
2026-07-31T01:31:10.255950

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
0.7681 USD/h 2.5865 USD/h
Oregon (US) / us-west-2
1.0459 USD/h 2.5865 USD/h
Northern Virgina (US) / us-east-1
1.03752 USD/h 2.5865 USD/h
Aragón (ES) / eu-south-2
0.516533 USD/h 2.7746 USD/h
Dublin (IE) / eu-west-1
1.20435 USD/h 2.7751 USD/h
Frankfurt (DE) / eu-central-1
0.947467 USD/h 2.9518 USD/h
Tokyo (JP) / ap-northeast-1
0.751667 USD/h 3.2558 USD/h

Processor

vCPUs
48
Hypervisor
nitro
CPU Allocation
Dedicated
CPU Cores
48
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
2 MiB
CPU L2 Cache
1 MiB
CPU L2 Cache Total
48 MiB
CPU L3 Cache
32 MiB
CPU L3 Cache Total
192 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
47.4
Scalability
98.75

System Resources and Accelerators

MEMORY
Memory Amount
96 GiB
Memory Amount Actual
96 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
      22.5 Gbps
      Network Speed Max
      22.5 Gbps
      Network Storage Speed Baseline
      15 Gbps
      Network Storage Speed Max
      15 Gbps
      Inbound Traffic
      0 GB/month
      Outbound Traffic
      0 GB/month
      IPv4
      0

      Server Description

      A dedicated 48-core AMD EPYC compute-optimized server with DDR5 memory, engineered for high-throughput processing and compute-intensive workloads.

      Compute Optimized

      Amazon Web Services c8a.12xlarge is an x86_64 compute-optimized server featuring 48 dedicated physical cores and 48 vCPUs powered by an AMD EPYC 9R45 processor running at 4.5 GHz. It includes 96.0 GB of DDR5 memory at 6 GHz, providing a resource density of 2.0 GB per core, but lacks local storage and GPU accelerators. Built on the Nitro hypervisor, it delivers 22 Gbps baseline network bandwidth. Benchmark data places this instance in the top tier (top 10%) for single-core and multi-core CPU execution, software compilation, and database operations. The low memory-to-core ratio and lack of local storage represent a tradeoff, making it highly cost-efficient for compute-heavy, non-storage-intensive workloads. It is suited for tasks such as software compilation, batch processing, and CPU-based inference.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      5.58Score
      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) 16,662,025 ops/sec 1,896,415 ops/sec 8.79 50.00% 50.00% +196.00%
      Redis RPS (pipeline=16, SET) 107,560,740 ops/sec 11,539,523 ops/sec 9.32 20.00% 20.00% +56.30%
      PassMark Memory Mark (composite) 2,908 2,411 1.21 10.00% 10.00% +1.92%
      Memory bandwidth (read, 16 MB ~ L3) 357,838 MB/sec 107,368 MB/sec 3.33 10.00% 10.00% +12.80%
      PassMark single-thread CPU 3,815 Mops/s 2,363 Mops/s 1.61 10.00% 10.00% +4.88%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 2,818

      Geekbench Multi-Core

      Score: 29,814

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 102416
      Compression
      		 1479296
      Encryption
      		 75619
      Extended Instructions
      		 129410
      Floating Point Maths
      		 364394
      Integer Maths
      		 363086
      Physics
      		 17020
      Prime Numbers
      		 1284
      Single Threaded
      		 3815
      String Sorting
      		 204308

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2908
      Database Operations
      		 41380
      Memory Latency
      		 82
      Memory Read Cached
      		 33961
      Memory Read Uncached
      		 32540
      Memory Write
      		 32734

      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
      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.16xlarge 64128 GiB0

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      c8a.12xlarge FAQs