B4ms by Microsoft Azure

B4ms is a BS family [Memory Intensive] [Premium Storage capable] [Intel processor] 4 vCPUs server offered by Microsoft Azure with 4 vCPUs, 16 GiB of memory and 33 GB of storage. The pricing starts at 0.166 USD per hour.
4 vCPU
16 GiB Memory
33 GB Storage
Spare SCore
4,946
(All-cores)
1,245
(Single-core)

Specifications

Server Metadata

Vendor ID
azure
Server ID
Standard_B4ms
Name
B4ms
API Reference
Standard_B4ms
Description
BS family [Memory Intensive] [Premium Storage capable] [Intel processor] 4 vCPUs
Family
BS
Hw Virt
Average Time To Start
22.5
Status
planned-for-retirement
Observed At
2026-11-02T00:34:40.735928

Availability

REGION / IDSPOTONDEMAND
East US (US) / eastus
- 0.166 USD/h
East US 2 (US) / eastus2
- 0.166 USD/h
North Central US (US) / northcentralus
- 0.166 USD/h
West US 2 (US) / westus2
- 0.166 USD/h
West US 3 (US) / westus3
- 0.166 USD/h
Sweden Central (SE) / swedencentral
- 0.173 USD/h
Jio India Central (IN) / jioindiacentral
- 0.179 USD/h
Jio India West (IN) / jioindiawest
- 0.179 USD/h
North Europe (IE) / northeurope
- 0.182 USD/h
Spain Central (ES) / spaincentral
- 0.183 USD/h
Canada Central (CA) / canadacentral
- 0.185 USD/h
UK West (GB) / ukwest
- 0.188 USD/h
France Central (FR) / francecentral
- 0.189 USD/h
Indonesia Central (ID) / indonesiacentral
- 0.19 USD/h
Malaysia West (MY) / malaysiawest
- 0.19 USD/h
Austria East (AT) / austriaeast
- 0.192 USD/h
Belgium Central (BE) / belgiumcentral
- 0.192 USD/h
Germany West Central (DE) / germanywestcentral
- 0.192 USD/h
Italy North (IT) / italynorth
- 0.192 USD/h
Poland Central (PL) / polandcentral
- 0.192 USD/h
West Europe (NL) / westeurope
- 0.192 USD/h
West US (US) / westus
- 0.198 USD/h
Central US (US) / centralus
- 0.2 USD/h
South Central US (US) / southcentralus
- 0.2 USD/h
UAE North (AE) / uaenorth
- 0.2 USD/h
West Central US (US) / westcentralus
- 0.2 USD/h
Qatar Central (QA) / qatarcentral
- 0.201 USD/h
Korea South (KR) / koreasouth
- 0.207 USD/h
Korea Central (KR) / koreacentral
- 0.208 USD/h
Australia Central (AU) / australiacentral
- 0.211 USD/h
Australia Central 2 (AU) / australiacentral2
- 0.211 USD/h
Australia East (AU) / australiaeast
- 0.211 USD/h
Australia Southeast (AU) / australiasoutheast
- 0.211 USD/h
Norway East (NO) / norwayeast
- 0.211 USD/h
Southeast Asia (SG) / southeastasia
- 0.211 USD/h
Switzerland North (CH) / switzerlandnorth
- 0.2112 USD/h
Japan East (JP) / japaneast
- 0.218 USD/h
East Asia (HK) / eastasia
- 0.234 USD/h
South India (IN) / southindia
- 0.236 USD/h
Japan West (JP) / japanwest
- 0.24 USD/h
Germany North (DE) / germanynorth
- 0.25 USD/h
UAE Central (AE) / uaecentral
- 0.25 USD/h
Brazil South (BR) / brazilsouth
- 0.269 USD/h
France South (FR) / francesouth
- 0.27 USD/h
South Africa West (ZA) / southafricawest
- 0.2712 USD/h
Switzerland West (CH) / switzerlandwest
- 0.2755 USD/h
Brazil Southeast (US) / brazilsoutheast
- 0.349 USD/h

Processor

vCPUs
4
Hypervisor
Microsoft Hyper-V
CPU Allocation
Burstable
CPU Cores
4
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
128 KiB
CPU L1I Cache
32 KiB
CPU L1I Cache Total
128 KiB
CPU L2 Cache
1 MiB
CPU L2 Cache Total
4 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
4
Scalability
100

System Resources and Accelerators

MEMORY
Memory Amount
16 GiB
Memory Amount Actual
16 GiB
ACCELERATORS
Accelerator Count
0
Accelerator Memory Min
0 MiB
Accelerator Memory Total
0 MiB
Accelerators
    STORAGE
    Storage Size
    33 GB
    Storage Type
    ssd
    Storages
    • 33 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 virtual machine with balanced memory and local storage, designed for workloads with variable CPU utilization demands.

    Burstable & BudgetGeneral Purpose

    Microsoft Azure B4ms is a burstable virtual machine from the BS family, utilizing an Intel Xeon 8272CL processor with 4 vCPUs and 16.0 GB of RAM. Operating on the Microsoft Hyper-V hypervisor, this x86_64 server includes 33 GB of local storage. Benchmark data shows weak single-core and multi-core CPU performance, placing in the bottom 25% for stress-ng and Geekbench. However, it achieves average scores in Passmark database operations and memory bandwidth for small cached blocks. Due to its burstable CPU allocation, the B4ms offers a cost-effective profile for workloads with variable CPU demands. It is suited for low-traffic web serving, small databases, and development environments rather than sustained high-compute tasks.

    Economics

    Average Price per Region

    Prices per Zone

    Lowest Prices

    Performance

    Workload Profiles

    0.35Score
    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) 520,655 ops/sec 1,918,343 ops/sec 0.27 50.00% 50.00% -48.00%
    Redis RPS (pipeline=16, SET) 3,314,674 ops/sec 11,704,734 ops/sec 0.28 20.00% 20.00% -22.00%
    PassMark Memory Mark (composite) 2,143 2,416 0.88 10.00% 10.00% -1.30%
    Memory bandwidth (read, 16 MB ~ L3) 41,649 MB/sec 108,466 MB/sec 0.38 10.00% 10.00% -9.20%
    PassMark single-thread CPU 1,842 Mops/s 2,365 Mops/s 0.75 10.00% 10.00% -2.80%

    Memory Bandwidth

    Compression

    OpenSSL

    Geekbench Single-Core

    Score: 1,063

    Geekbench Multi-Core

    Score: 3,533

    Passmark CPU Scores

    BENCHMARKSCORE
    Mark
    		 5,798
    Compression
    		 72,268
    Encryption
    		 1,845
    Extended Instructions
    		 6,134
    Floating Point Maths
    		 11,659
    Integer Maths
    		 14,350
    Physics
    		 773
    Prime Numbers
    		 46
    Single Threaded
    		 1,842
    String Sorting
    		 8,728

    Passmark Memory Scores

    BENCHMARKSCORE
    Memory Mark
    		 2,143
    Database Operations
    		 2,693
    Memory Latency
    		 49
    Memory Read Cached
    		 21,712
    Memory Read Uncached
    		 10,503
    Memory Write
    		 9,423

    Stress-ng Stressors

    CPU integerSingleMultiScaling
    atomic
    		 199.83 207.24 1.04×
    bitops
    		 98,823 393,296 3.98×
    branch
    		 136,316 536,451 3.94×
    funccall
    		 480.41 1,898 3.95×
    funcret
    		 9,999 39,536 3.95×
    hash
    		 111,563 437,455 3.92×
    intmath
    		 19,735 77,725 3.94×
    nop
    		 168,920 670,289 3.97×
    prime
    		 279,639 1,108,262 3.96×
    rotate
    		 85,330 337,025 3.95×
    str
    		 647,813 2,547,750 3.93×
    wcs
    		 428,943 1,688,346 3.94×
    CryptographySingleMultiScaling
    crypt
    		 2,154 8,545 3.97×
    CompressionSingleMultiScaling
    jpeg
    		 510.76 2,006 3.93×
    zlib
    		 45.04 171.11 3.80×
    HypervisorSingleMultiScaling
    clock
    		 17,449 65,238 3.74×
    clone
    		 978.78 2,761 2.82×
    context
    		 1,727 6,832 3.96×
    cpu-sched
    		 66.76 264 3.95×
    eventfd
    		 29,939 299,398 10.00×
    fault
    		 8,966 28,335 3.16×
    fork
    		 3,452 12,951 3.75×
    getrandom
    		 39,335 154,692 3.93×
    hrtimers
    		 193,923 383,848 1.98×
    mprotect
    		 743,451 857,251 1.15×
    mtx
    		 12,072,429 112,325,323 9.30×
    munmap
    		 2,383 9,815 4.12×
    null
    		 183,732 720,373 3.92×
    pipe
    		 841,839 1,950,260 2.32×
    priv-instr
    		 396,753 1,536,342 3.87×
    resched
    		 806,480 440,055 0.55×
    switch
    		 60,505 862,912 14.26×
    timermix
    		 190,825 671,992 3.52×
    tlb-shootdown
    		 7,873 11,072 1.41×
    tsc
    		 874,290 3,472,024 3.97×
    usersyscall
    		 274,317 1,064,969 3.88×
    vdso
    		 65,476,922 258,945,703 3.95×
    vfork
    		 21,202 76,258 3.60×
    x86syscall
    		 2,047,721 8,202,529 4.01×
    yield
    		 2,360,740 2,371,205 1.00×
    zero
    		 1,365,690 5,446,169 3.99×
    CPU float/SIMDSingleMultiScaling
    eigen
    		 14,333 56,529 3.94×
    expmath
    		 2,378 9,430 3.97×
    fma
    		 583,829 2,217,828 3.80×
    fp
    		 144 568.39 3.95×
    fractal
    		 4.6 18.2 3.96×
    hyperbolic
    		 2,485 9,688 3.90×
    logmath
    		 4,012 15,908 3.96×
    matrix
    		 2,854 11,292 3.96×
    matrix-3d
    		 635.03 1,658 2.61×
    monte-carlo
    		 96.22 383.87 3.99×
    mpfr
    		 1,070 4,175 3.90×
    powmath
    		 1,404 5,562 3.96×
    trig
    		 1,517 6,018 3.97×
    veccmp
    		 13,812 54,456 3.94×
    vecfp
    		 2,012 7,906 3.93×
    vecmath
    		 1,898 7,509 3.96×
    vecshuf
    		 830.98 3,297 3.97×
    vecwide
    		 50,041 198,200 3.96×
    AlgorithmsSingleMultiScaling
    bitonicsort
    		 6.4 25.6 4.00×
    bsearch
    		 212.89 844.73 3.97×
    bubblesort
    		 0.6 2.4 4.00×
    fibsearch
    		 216.32 856.9 3.96×
    heapsort
    		 7.8 30.4 3.90×
    hsearch
    		 4,361 17,294 3.97×
    insertionsort
    		 7.2 28.8 4.00×
    malloc
    		 1,813,181 9,648,617 5.32×
    mcontend
    		 122.67 936.7 7.64×
    mergesort
    		 20.6 81.6 3.96×
    qsort
    		 13.2 52 3.94×
    skiplist
    		 4,318 17,056 3.95×
    tree
    		 1.4 4.8 3.43×
    MemorySingleMultiScaling
    cache
    		 269,522 351,434 1.30×
    cachehammer
    		 415,726 1,609,960 3.87×
    cacheline
    		 24.06 93.96 3.91×
    l1cache
    		 200.85 796.04 3.96×
    memcpy
    		 307.4 1,219 3.97×
    memrate
    		 1.36 4.69 3.45×
    memthrash
    		 49.85 182.4 3.66×
    ptr-chase
    		 20,521,664 56,227,914 2.74×
    spinmem
    		 366.98 301.14 0.82×
    stream
    		 27.34 453.03 16.57×
    vm
    		 59,680 270,768 4.54×

    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

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    B4ms FAQs