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B12ms by Microsoft Azure

B12ms is a BS family [Memory Intensive] [Premium Storage capable] [Intel processor] 12 vCPUs server offered by Microsoft Azure with 12 vCPUs, 48 GiB of memory and 98 GB of storage. The pricing starts at 0.499 USD per hour.
12 vCPU
48 GiB Memory
98 GB Storage
Spare SCore
12139
(All-cores)
1040
(Single-core)

Specifications

Server Metadata

Vendor ID
azure
Server ID
Standard_B12ms
Name
B12ms
API Reference
Standard_B12ms
Description
BS family [Memory Intensive] [Premium Storage capable] [Intel processor] 12 vCPUs
Family
BS
Hw Virt
Average Time To Start
26
Status
active
Observed At
2026-07-30T15:03:13.414278

Availability

REGION / IDSPOTONDEMAND
East US (US) / eastus
- 0.499 USD/h
East US 2 (US) / eastus2
- 0.499 USD/h
North Central US (US) / northcentralus
- 0.499 USD/h
West US 2 (US) / westus2
- 0.499 USD/h
West US 3 (US) / westus3
- 0.499 USD/h
Sweden Central (SE) / swedencentral
- 0.518 USD/h
Central India (IN) / centralindia
- 0.538 USD/h
Jio India Central (IN) / jioindiacentral
- 0.538 USD/h
Jio India West (IN) / jioindiawest
- 0.538 USD/h
North Europe (IE) / northeurope
- 0.546 USD/h
Mexico Central (ZA) / mexicocentral
- 0.549 USD/h
Spain Central (ES) / spaincentral
- 0.549 USD/h
Canada Central (CA) / canadacentral
- 0.556 USD/h
Canada East (CA) / canadaeast
- 0.557 USD/h
UK West (GB) / ukwest
- 0.564 USD/h
France Central (FR) / francecentral
- 0.566 USD/h
UK South (GB) / uksouth
- 0.566 USD/h
Indonesia Central (ID) / indonesiacentral
- 0.57 USD/h
Malaysia West (MY) / malaysiawest
- 0.57 USD/h
Austria East (AT) / austriaeast
- 0.576 USD/h
Belgium Central (BE) / belgiumcentral
- 0.576 USD/h
Germany West Central (DE) / germanywestcentral
- 0.576 USD/h
Israel Central (IL) / israelcentral
- 0.576 USD/h
Italy North (IT) / italynorth
- 0.576 USD/h
Poland Central (PL) / polandcentral
- 0.576 USD/h
West Europe (NL) / westeurope
- 0.576 USD/h
West US (US) / westus
- 0.595 USD/h
Central US (US) / centralus
- 0.599 USD/h
South Central US (US) / southcentralus
- 0.599 USD/h
UAE North (AE) / uaenorth
- 0.599 USD/h
West Central US (US) / westcentralus
- 0.599 USD/h
Qatar Central (QA) / qatarcentral
- 0.602 USD/h
Korea South (KR) / koreasouth
- 0.622 USD/h
Korea Central (KR) / koreacentral
- 0.624 USD/h
Switzerland North (CH) / switzerlandnorth
- 0.6336 USD/h
Australia Central (AU) / australiacentral
- 0.634 USD/h
Australia Central 2 (AU) / australiacentral2
- 0.634 USD/h
Australia East (AU) / australiaeast
- 0.634 USD/h
Australia Southeast (AU) / australiasoutheast
- 0.634 USD/h
Norway East (NO) / norwayeast
- 0.634 USD/h
Southeast Asia (SG) / southeastasia
- 0.634 USD/h
South Africa North (ZA) / southafricanorth
- 0.651 USD/h
Japan East (JP) / japaneast
- 0.653 USD/h
New Zealand North (NZ) / newzealandnorth
- 0.665 USD/h
Chile Central (CL) / chilecentral
- 0.699 USD/h
East Asia (HK) / eastasia
- 0.701 USD/h
South India (IN) / southindia
- 0.706 USD/h
West India (IN) / westindia
- 0.714 USD/h
Japan West (JP) / japanwest
- 0.719 USD/h
Germany North (DE) / germanynorth
- 0.749 USD/h
UAE Central (AE) / uaecentral
- 0.749 USD/h
Brazil South (BR) / brazilsouth
- 0.806 USD/h
France South (FR) / francesouth
- 0.811 USD/h
South Africa West (ZA) / southafricawest
- 0.8137 USD/h
Switzerland West (CH) / switzerlandwest
- 0.8231 USD/h
Norway West (NO) / norwaywest
- 0.824 USD/h
Brazil Southeast (US) / brazilsoutheast
- 1.048 USD/h

Processor

vCPUs
12
Hypervisor
Microsoft Hyper-V
CPU Allocation
Burstable
CPU Cores
12
CPU Speed
2.6 GHz
CPU Architecture
x86_64
CPU Manufacturer
Intel
CPU Family
Xeon
CPU Model
8272CL
CPU L1D Cache
32 KiB
CPU L1D Cache Total
384 KiB
CPU L1I Cache
32 KiB
CPU L1I Cache Total
384 KiB
CPU L2 Cache
1 MiB
CPU L2 Cache Total
12 MiB
CPU L3 Cache
36 MiB
CPU L3 Cache Total
36 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, cpuid, pni, pclmulqdq, ssse3, fma, cx16, pcid, sse4_1, sse4_2, movbe, popcnt, aes, xsave, avx, f16c, rdrand, hypervisor, lahf_lm, abm, 3dnowprefetch, pti, fsgsbase, bmi1, hle, avx2, smep, bmi2, erms, invpcid, rtm, avx512f, avx512dq, rdseed, adx, smap, clflushopt, avx512cd, avx512bw, avx512vl, xsaveopt, xsavec, xsaves, md_clear
Ecpus
11.7
Scalability
97.5

System Resources and Accelerators

MEMORY
Memory Amount
48 GiB
Memory Amount Actual
48 GiB
GPU
GPU Count
0
GPU Memory Min
0 MiB
GPU Memory Total
0 MiB
GPUs
    STORAGE
    Storage Size
    98 GB
    Storages
    • 98 GB ssd (temp disk)
    NETWORK
    Inbound Traffic
    0 GB/month
    Outbound Traffic
    0 GB/month
    IPv4
    0

    CPU and System Topology

    Server Description

    A burstable x86_64 virtual machine combining twelve Intel Xeon cores with forty-eight gigabytes of memory for variable multi-threaded workloads.

    Burstable & BudgetGeneral Purpose

    Microsoft Azure B12ms is an x86_64 burstable virtual machine from the BS server family, powered by an Intel Xeon 8272CL processor running at 2.6 GHz. It features 12 vCPUs, 12 physical cores, 48.0 GB of RAM, and 98 GB of local storage with Premium Storage capability. Benchmark results indicate a clear performance tradeoff: single-core CPU execution and single-threaded compression tasks are weak, placing in the bottom 25%, while multi-core operations, memory bandwidth, and database operations perform at an average level within the middle 50%. The burstable CPU allocation provides a cost-efficient resource model for variable workloads rather than sustained high-compute tasks. This configuration is suitable for database operations, Redis caching, and static web serving where resource demands fluctuate.

    Economics

    Average Price per Region

    Prices per Zone

    Lowest Prices

    Performance

    Workload Profiles

    0.843Score
    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) 1,556,314 ops/sec 1,896,415 ops/sec 0.821 50.00% 50.00% -9.39%
    Redis RPS (pipeline=16, SET) 9,684,434 ops/sec 11,539,523 ops/sec 0.839 20.00% 20.00% -3.45%
    PassMark Memory Mark (composite) 2,635 2,411 1.09 10.00% 10.00% +0.87%
    Memory bandwidth (read, 16 MB ~ L3) 87,173 MB/sec 107,368 MB/sec 0.812 10.00% 10.00% -2.06%
    PassMark single-thread CPU 1,843 Mops/s 2,363 Mops/s 0.78 10.00% 10.00% -2.45%

    Memory Bandwidth

    Compression

    OpenSSL

    Geekbench Single-Core

    Score: 1,045

    Geekbench Multi-Core

    Score: 7,375

    Passmark CPU Scores

    BENCHMARKSCORE
    Mark
    		 15897
    Compression
    		 218851
    Encryption
    		 5556
    Extended Instructions
    		 18369
    Floating Point Maths
    		 36126
    Integer Maths
    		 43175
    Physics
    		 1735
    Prime Numbers
    		 118
    Single Threaded
    		 1843
    String Sorting
    		 26164

    Passmark Memory Scores

    BENCHMARKSCORE
    Memory Mark
    		 2635
    Database Operations
    		 7923
    Memory Latency
    		 49
    Memory Read Cached
    		 21729
    Memory Read Uncached
    		 11408
    Memory Write
    		 10227

    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
    B1ls 10.5 GiB0
    B1s 11 GiB0
    B1ms 12 GiB0
    B2s 24 GiB0
    B2ms 28 GiB0
    B4ms 416 GiB0
    B8ms 832 GiB0

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    B12ms FAQs