c5.18xlarge by Amazon Web Services

c5.18xlarge is a Compute optimized Gen5 18xlarge server offered by Amazon Web Services with 72 vCPUs, 144 GiB of memory and 0 GB of storage. The pricing starts at 0.306 USD per hour.
72 vCPU
144 GiB Memory
Spare SCore
66,687
(All-cores)
1,425
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
c5.18xlarge
Description
Compute optimized Gen5 18xlarge
Family
c5
Hw Virt
Status
active
Observed At
2026-10-26T10:39:47.745000

Availability

REGION / IDSPOTONDEMAND
Hyderabad (IN) / ap-south-2
0.306 USD/h 3.06 USD/h
Ohio (US) / us-east-2
0.503267 USD/h 3.06 USD/h
Mumbai (IN) / ap-south-1
0.7219 USD/h 3.06 USD/h
Northern Virgina (US) / us-east-1
0.93794 USD/h 3.06 USD/h
Oregon (US) / us-west-2
1.380975 USD/h 3.06 USD/h
Stockholm (SE) / eu-north-1
0.3276 USD/h 3.276 USD/h
Calgary (CA) / ca-west-1
2.355533 USD/h 3.348 USD/h
Quebec (CA) / ca-central-1
0.914633 USD/h 3.348 USD/h
Seoul (KR) / ap-northeast-2
0.5132 USD/h 3.456 USD/h
Aragón (ES) / eu-south-2
1.537933 USD/h 3.456 USD/h
Dublin (IE) / eu-west-1
1.399733 USD/h 3.456 USD/h
Frankfurt (DE) / eu-central-1
1.1443 USD/h 3.492 USD/h
Jakarta (ID) / ap-southeast-3
0.3528 USD/h 3.528 USD/h
Singapore (SG) / ap-southeast-1
1.143033 USD/h 3.528 USD/h
Tel Aviv (IL) / il-central-1
0.827267 USD/h 3.629 USD/h
Paris (FR) / eu-west-3
0.633367 USD/h 3.636 USD/h
London (GB) / eu-west-2
0.7774 USD/h 3.636 USD/h
Milan (IT) / eu-south-1
0.6679 USD/h 3.636 USD/h
United Arab Emirates / me-central-1
1.5564 USD/h 3.802 USD/h
California (US) / us-west-1
1.1748 USD/h 3.816 USD/h
Zurich (CH) / eu-central-2
0.775433 USD/h 3.841 USD/h
Tokyo (JP) / ap-northeast-1
1.147 USD/h 3.852 USD/h
Osaka (JP) / ap-northeast-3
1.099567 USD/h 3.852 USD/h
Hong Kong (HK) / ap-east-1
0.558933 USD/h 3.888 USD/h
Melbourne (AU) / ap-southeast-4
1.872133 USD/h 3.996 USD/h
Sydney (AU) / ap-southeast-2
1.393133 USD/h 3.996 USD/h
Cape Town (ZA) / af-south-1
0.771 USD/h 4.104 USD/h
Sao Paulo (BR) / sa-east-1
0.762833 USD/h 4.716 USD/h

Processor

vCPUs
72
Hypervisor
nitro
CPU Allocation
Dedicated
CPU Cores
36
CPU Speed
3.4 GHz
CPU Architecture
x86_64
CPU Manufacturer
Intel
CPU Family
Xeon
CPU Model
8223CL
CPU L1D Cache
32 KiB
CPU L1D Cache Total
1 MiB
CPU L1I Cache
32 KiB
CPU L1I Cache Total
1 MiB
CPU L2 Cache
1 MiB
CPU L2 Cache Total
36 MiB
CPU L3 Cache
25 MiB
CPU L3 Cache Total
50 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, ss, ht, syscall, nx, pdpe1gb, rdtscp, lm, constant_tsc, arch_perfmon, rep_good, nopl, xtopology, nonstop_tsc, cpuid, aperfmperf, tsc_known_freq, pni, pclmulqdq, monitor, ssse3, fma, cx16, pcid, sse4_1, sse4_2, x2apic, movbe, popcnt, tsc_deadline_timer, aes, xsave, avx, f16c, rdrand, hypervisor, lahf_lm, abm, 3dnowprefetch, pti, fsgsbase, tsc_adjust, bmi1, avx2, smep, bmi2, erms, invpcid, mpx, avx512f, avx512dq, rdseed, adx, smap, clflushopt, clwb, avx512cd, avx512bw, avx512vl, xsaveopt, xsavec, xgetbv1, xsaves, ida, arat, pku, ospke
Ecpus
46.8
Scalability
65

System Resources and Accelerators

MEMORY
Memory Amount
144 GiB
Memory Amount Actual
144 GiB
Memory Generation
DDR4
Memory Speed
2666 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
      25 Gbps
      Network Speed Max
      25 Gbps
      Network Storage Speed Baseline
      19 Gbps
      Network Storage Speed Max
      19 Gbps
      Inbound Traffic
      0 GB/month
      Outbound Traffic
      0 GB/month
      IPv4
      0

      Server Description

      A high-density, compute-optimized virtual server featuring seventy-two vCPUs and strong multi-core performance for demanding parallel processing workloads.

      Compute OptimizedGeneral Purpose

      Amazon Web Services c5.18xlarge is a compute-optimized instance utilizing the Nitro hypervisor and an Intel Xeon 8223CL processor. It provides 72 vCPUs (36 physical cores) running at 3.4 GHz, paired with 144.0 GB of DDR4 memory. This configuration yields a 2.0 GB per core memory ratio, with no local storage or GPU accelerators. The instance delivers strong multi-core CPU performance and high memory bandwidth, as evidenced by top-quartile stress-ng and PassMark extended instruction scores. However, single-core performance and LLM text generation speeds are average to weak. Given its high compute density and 25 Gbps baseline network bandwidth, the c5.18xlarge is suited for multi-threaded batch processing, database operations, and CPU-bound workloads, offering a balanced cost-to-performance ratio for compute-heavy tasks that do not require massive memory footprints.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      2.5Score
      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) 6,567,198 ops/sec 1,919,289 ops/sec 3.5 50.00% 50.00% +87.00%
      Redis RPS (pipeline=16, SET) 36,918,393 ops/sec 11,728,058 ops/sec 3.1 20.00% 20.00% +25.00%
      PassMark Memory Mark (composite) 2,685 2,416 1.1 10.00% 10.00% +0.96%
      Memory bandwidth (read, 16 MB ~ L3) 215,973 MB/sec 108,466 MB/sec 2 10.00% 10.00% +7.20%
      PassMark single-thread CPU 2,005 Mops/s 2,365 Mops/s 0.83 10.00% 10.00% -1.80%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 1,189

      Geekbench Multi-Core

      Score: 12,139

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 49,988
      Compression
      		 977,849
      Encryption
      		 30,433
      Extended Instructions
      		 67,018
      Floating Point Maths
      		 119,656
      Integer Maths
      		 223,649
      Physics
      		 4,405
      Prime Numbers
      		 265
      Single Threaded
      		 2,005
      String Sorting
      		 111,747

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2,685
      Database Operations
      		 22,109
      Memory Latency
      		 53
      Memory Read Cached
      		 24,492
      Memory Read Uncached
      		 10,319
      Memory Write
      		 10,077

      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

      INSTANCEvCPUsMEMORYAccelerators
      c5.large 24 GiB0
      c5.xlarge 48 GiB0
      c5.2xlarge 816 GiB0
      c5.4xlarge 1632 GiB0
      c5.9xlarge 3672 GiB0
      c5.12xlarge 4896 GiB0
      c5.24xlarge 96192 GiB0

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      c5.18xlarge FAQs