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 0.3268 USD per hour.
48 vCPU
384 GiB Memory
Spare SCore
52,010
(All-cores)
2,131
(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
2026-10-29T02:46:22.898939

Availability

REGION / IDSPOTONDEMAND
Ohio (US) / us-east-2
0.6836 USD/h 3.1673 USD/h
Northern Virgina (US) / us-east-1
1.29398 USD/h 3.1673 USD/h
Oregon (US) / us-west-2
1.306875 USD/h 3.1673 USD/h
(MY) / ap-southeast-5
0.998067 USD/h 3.2477 USD/h
Hyderabad (IN) / ap-south-2
0.3268 USD/h 3.2678 USD/h
Mumbai (IN) / ap-south-1
0.8438 USD/h 3.2678 USD/h
Stockholm (SE) / eu-north-1
0.4197 USD/h 3.3684 USD/h
Quebec (CA) / ca-central-1
1.243267 USD/h 3.469 USD/h
Calgary (CA) / ca-west-1
0.3469 USD/h 3.469 USD/h
California (US) / us-west-1
0.648 USD/h 3.5191 USD/h
Aragón (ES) / eu-south-2
1.275933 USD/h 3.5443 USD/h
Dublin (IE) / eu-west-1
1.438133 USD/h 3.5443 USD/h
Milan (IT) / eu-south-1
0.812233 USD/h 3.7202 USD/h
Paris (FR) / eu-west-3
0.759467 USD/h 3.7202 USD/h
London (GB) / eu-west-2
1.535333 USD/h 3.7202 USD/h
Sydney (AU) / ap-southeast-2
1.133367 USD/h 3.7958 USD/h
Seoul (KR) / ap-northeast-2
0.85 USD/h 3.8208 USD/h
Tokyo (JP) / ap-northeast-1
1.438267 USD/h 3.8208 USD/h
Singapore (SG) / ap-southeast-1
1.458633 USD/h 3.8208 USD/h
Frankfurt (DE) / eu-central-1
1.6079 USD/h 3.8208 USD/h
(NZ) / ap-southeast-6
1.168867 USD/h 3.9854 USD/h
Zurich (CH) / eu-central-2
1.603133 USD/h 4.2029 USD/h
Cape Town (ZA) / af-south-1
0.6799 USD/h 4.223 USD/h
Sao Paulo (BR) / sa-east-1
0.760233 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
50.83

System Resources and Accelerators

MEMORY
Memory Amount
384 GiB
Memory Amount Actual
384 GiB
Memory Generation
DDR5
Memory Speed
7200 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
      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 x86_64 server featuring high-speed DDR5 RAM and advanced matrix extensions for demanding database and memory-intensive workloads.

      Memory OptimizedGeneral Purpose

      Amazon Web Services r8i-flex.12xlarge is a memory-optimized server designed for resource-intensive workloads. Powered by an Intel Xeon 6975P-C processor running at 3.9 GHz, it delivers 48 vCPUs and 384.0 GB of high-speed 7 GHz DDR5 memory. The architecture features a large 480 MB L3 cache and supports Intel Advanced Matrix Extensions (AMX) and AVX-512. Operating on the Nitro hypervisor, the instance lacks local storage and GPUs but provides an 11 Gbps baseline network bandwidth. Benchmarks indicate strong memory bandwidth, top-tier text and image processing, and strong database performance, handling 87.47 million Redis SET operations per second. This profile makes the server highly efficient for in-memory databases, enterprise software compilation, and CPU-based machine learning inference.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      3.5Score
      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) 10,462,231 ops/sec 1,919,289 ops/sec 5.3 50.00% 50.00% +130.00%
      Redis RPS (pipeline=16, SET) 60,383,046 ops/sec 11,728,058 ops/sec 5 20.00% 20.00% +38.00%
      PassMark Memory Mark (composite) 2,475 2,416 1 10.00% 10.00% 0.00%
      Memory bandwidth (read, 16 MB ~ L3) 234,677 MB/sec 108,466 MB/sec 2.1 10.00% 10.00% +7.70%
      PassMark single-thread CPU 3,276 Mops/s 2,365 Mops/s 1.4 10.00% 10.00% +3.40%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 2,188

      Geekbench Multi-Core

      Score: 19,389

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 69,285
      Compression
      		 959,084
      Encryption
      		 54,844
      Extended Instructions
      		 67,745
      Floating Point Maths
      		 179,729
      Integer Maths
      		 248,115
      Physics
      		 8,108
      Prime Numbers
      		 479
      Single Threaded
      		 3,276
      String Sorting
      		 124,070

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2,475
      Database Operations
      		 23,204
      Memory Latency
      		 69
      Memory Read Cached
      		 28,780
      Memory Read Uncached
      		 10,131
      Memory Write
      		 10,892

      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
      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