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r8i-flex.12xlarge by Amazon Web Services

r8i-flex.12xlarge is a Memory optimized [Intel processors] Gen8 12xlarge server offered by Amazon Web Services with 48 vCPUs, 384 GiB of memory and 0 GB of storage. The pricing starts at 0.4442 USD per hour.
48 vCPU
384 GiB Memory
Spare SCore
52010
(All-cores)
2131
(Single-core)

Specifications

Server Metadata

Vendor ID
aws
Name
r8i-flex.12xlarge
Description
Memory optimized [Intel processors] Gen8 12xlarge
Family
r8i-flex
Hw Virt
Status
active
Observed At
2026-07-29T16:36:39.768102

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
0.938367 USD/h 3.1673 USD/h
Northern Virgina (US) / us-east-1
1.37794 USD/h 3.1673 USD/h
Oregon (US) / us-west-2
1.42915 USD/h 3.1673 USD/h
(MY) / ap-southeast-5
1.268133 USD/h 3.2477 USD/h
Mumbai (IN) / ap-south-1
1.077567 USD/h 3.2678 USD/h
Hyderabad (IN) / ap-south-2
1.005533 USD/h 3.2678 USD/h
Stockholm (SE) / eu-north-1
0.63685 USD/h 3.3684 USD/h
Quebec (CA) / ca-central-1
2.800867 USD/h 3.469 USD/h
California (US) / us-west-1
0.97935 USD/h 3.5191 USD/h
Aragón (ES) / eu-south-2
0.784067 USD/h 3.5443 USD/h
Dublin (IE) / eu-west-1
1.6803 USD/h 3.5443 USD/h
Paris (FR) / eu-west-3
1.037433 USD/h 3.7202 USD/h
London (GB) / eu-west-2
1.716467 USD/h 3.7202 USD/h
Sydney (AU) / ap-southeast-2
1.516333 USD/h 3.7958 USD/h
Seoul (KR) / ap-northeast-2
1.3453 USD/h 3.8208 USD/h
Tokyo (JP) / ap-northeast-1
1.2851 USD/h 3.8208 USD/h
Singapore (SG) / ap-southeast-1
1.647667 USD/h 3.8208 USD/h
Frankfurt (DE) / eu-central-1
1.707467 USD/h 3.8208 USD/h
(NZ) / ap-southeast-6
1.446967 USD/h 3.9854 USD/h
Zurich (CH) / eu-central-2
1.5987 USD/h 4.2029 USD/h
Cape Town (ZA) / af-south-1
0.7723 USD/h 4.223 USD/h
Sao Paulo (BR) / sa-east-1
3.1744 USD/h 5.0525 USD/h

Processor

vCPUs
48
Hypervisor
nitro
CPU Allocation
Dedicated
CPU Cores
24
CPU Speed
3.9 GHz
CPU Architecture
x86_64
CPU Manufacturer
Intel
CPU Family
Xeon
CPU Model
6975P-C
CPU L1D Cache
48 KiB
CPU L1D Cache Total
1 MiB
CPU L1I Cache
64 KiB
CPU L1I Cache Total
2 MiB
CPU L2 Cache
2 MiB
CPU L2 Cache Total
48 MiB
CPU L3 Cache
480 MiB
CPU L3 Cache Total
480 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, rep_good, nopl, xtopology, nonstop_tsc, cpuid, tsc_known_freq, pni, pclmulqdq, ssse3, fma, cx16, pdcm, pcid, sse4_1, sse4_2, x2apic, movbe, popcnt, tsc_deadline_timer, aes, xsave, avx, f16c, rdrand, hypervisor, lahf_lm, abm, 3dnowprefetch, cpuid_fault, ssbd, ibrs, ibpb, stibp, ibrs_enhanced, 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, wbnoinvd, ida, arat, avx512vbmi, umip, pku, ospke, waitpkg, avx512_vbmi2, gfni, vaes, vpclmulqdq, avx512_vnni, avx512_bitalg, tme, avx512_vpopcntdq, rdpid, bus_lock_detect, cldemote, movdiri, movdir64b, md_clear, serialize, amx_bf16, avx512_fp16, amx_tile, amx_int8, flush_l1d, arch_capabilities
Ecpus
24.4
Scalability
101.67

System Resources and Accelerators

MEMORY
Memory Amount
384 GiB
Memory Amount Actual
384 GiB
Memory Generation
DDR5
Memory Speed
7200 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
      11.25 Gbps
      Network Speed Max
      22.5 Gbps
      Network Storage Speed Baseline
      7.5 Gbps
      Network Storage Speed Max
      15 Gbps
      Inbound Traffic
      0 GB/month
      Outbound Traffic
      0 GB/month
      IPv4
      0

      Server Description

      A memory-optimized virtual server featuring high-speed DDR5 RAM and advanced Intel matrix extensions for database and memory-intensive workloads.

      Memory OptimizedCompute Optimized

      Amazon Web Services r8i-flex.12xlarge is a memory-optimized instance featuring 48 vCPUs powered by an Intel Xeon 6975P-C processor running at 3.9 GHz. Built on the x86_64 architecture and managed by the Nitro hypervisor, it delivers 384.0 GB of high-speed 7 GHz DDR5 memory, resulting in an 8.0 GB per core allocation. The instance lacks local storage and dedicated GPUs, but provides an 11 Gbps baseline network bandwidth. Benchmark data highlights top-tier single-core, image, and text processing capabilities, alongside strong memory read bandwidth and database performance. It also supports advanced instruction sets like Intel AMX and AVX-512, making it highly efficient for vector and matrix operations. This server is optimized for memory-intensive workloads, including database management, in-memory caching, and CPU-based machine learning inference.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      3.66Score
      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) 10,462,231 ops/sec 1,896,415 ops/sec 5.52 50.00% 50.00% +135.00%
      Redis RPS (pipeline=16, SET) 60,383,046 ops/sec 11,539,523 ops/sec 5.23 20.00% 20.00% +39.20%
      PassMark Memory Mark (composite) 2,475 2,411 1.03 10.00% 10.00% +0.30%
      Memory bandwidth (read, 16 MB ~ L3) 234,677 MB/sec 107,368 MB/sec 2.19 10.00% 10.00% +8.15%
      PassMark single-thread CPU 3,276 Mops/s 2,363 Mops/s 1.39 10.00% 10.00% +3.35%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 2,188

      Geekbench Multi-Core

      Score: 19,389

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 69285
      Compression
      		 959084
      Encryption
      		 54844
      Extended Instructions
      		 67745
      Floating Point Maths
      		 179729
      Integer Maths
      		 248115
      Physics
      		 8108
      Prime Numbers
      		 479
      Single Threaded
      		 3276
      String Sorting
      		 124070

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2475
      Database Operations
      		 23204
      Memory Latency
      		 69
      Memory Read Cached
      		 28780
      Memory Read Uncached
      		 10131
      Memory Write
      		 10892

      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
      r8i-flex.large 216 GiB0
      r8i-flex.xlarge 432 GiB0
      r8i-flex.2xlarge 864 GiB0
      r8i-flex.4xlarge 16128 GiB0
      r8i-flex.8xlarge 32256 GiB0
      r8i-flex.16xlarge 64512 GiB0

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      r8i-flex.12xlarge FAQs