Run Your CPU with Azure Burstable VM and Get the Best Performances with Less Costs

Have you heard about Azure Burstable Virtual Machines? It's a low-cost solution to keep your CPU running at its maximum speed. Say goodbye to overpaying for computing resources and welcome more value for your money!

Azure Burstable VMs offer an excellent blend of cost and performance. You may quickly scale up your CPU power as needed and pay just for what you use with this option. It's an excellent approach to maximizing your computing resources and maximizing your investment. Try it for yourself and notice the difference!

What Is a Burstable VM in Azure and Why Is It Used?

An Azure Burstable VM, also known as a B-series virtual machine, is a type of virtual machine in Azure that offers a low-cost, low-to-moderate performance choice for applications that do not require the full capability of the CPU all of the time. 

This sort of virtual machine is appropriate for applications with fluctuating CPU consumption patterns and is cost-effective, making it a great alternative for small to medium-sized applications, development and testing environments, and even tiny databases.

Burstable VMs in Azure are used to save money for customers that do not need the full power of the CPU all of the time but still want to be able to burst the CPU performance when needed for short periods of time.

Burstable VMs are billed per second, and users only pay for what they use, making it an excellent choice for cost-conscious corporations and organizations.

What Types of Burstable VM Are Available in Azure?

Azure provides a variety of Burstable VMs, including the following:

  1. 1

    B1s: A burstable virtual machine with a single vCPU and up to 1 GB of memory.

  2. 2

    B2s: A mid-sized Burstable VM with two virtual CPUs and up to four gigabytes of memory.

  3. 3

    B4ms: A large-scale Burstable VM with four vCPUs and up to sixteen gigabytes of memory.

  4. 4
    B8ms: A big Burstable VM with 8 vCPUs and up to 32 GB of memory. 

To accommodate varied workloads, each of these Burstable VMs has different CPU performance criteria and memory capacity. Customers can choose the type of Burstable VM that is best suited for their specific needs, based on the CPU and memory requirements of their applications.

What Are the Different B-series Burstable VM Sizes?

The different B-series Burstable VM sizes in Azure are:

  • Standard_B1ls2: 1 vCPU and up to 0.5 GB of memory with base CPU performance of VM being 5%.

  • Standard_B1ls: 1 vCPU and up to 1 GB of memory with base CPU performance of VM being 10%.

  • Standard_B1ms: 1 vCPU and up to 2 GB of memory with base CPU performance of VM being 20%.

  • Standard_B2s: 2 vCPU and up to 4 GB of memory with base CPU performance of VM being 40%. 

  • Standard_B2ms: 2 vCPU and up to 8 GB of memory with base CPU performance of VM being 60%.

  • Standard_B4ms: 4 vCPU and up to 16 GB of memory with base CPU performance of VM being 90%.

  • Standard_B8ms: 8 vCPU and up to 32 GB of memory with base CPU performance of VM being 135%.

  • Standard_B12ms: 12 vCPU and up to 48 GB of memory with base CPU performance of VM being 202%.

  • Standard_B16ms: 16 vCPU and up to 64 GB of memory with base CPU performance of VM being 270%.

  • Standard_B20ms: 20 vCPU and up to 80 GB of memory with base CPU performance of VM being 337%.

The various sizes of B-series Burstable VMs are appropriate for a variety of workloads, including development and testing, small to medium-sized applications, and small databases.  

Customers can select the size that best meets their needs based on the CPU performance and memory requirements of their applications.

What Are the Most Affordable Servers in Burstable B-series?

The B1s and B2s are the most cost-effective servers in Azure's Burstable B-Series. These smaller-sized VMs are targeted for cost-effectiveness and are designed for workloads with low to moderate CPU performance needs. 

It's worth noting, though, that the exact pricing of a Burstable B-Series VM may vary depending on a number of factors, including the location of the Azure data center, the period of use, and the specific configuration settings you select. 

You can use the Azure pricing calculator to get an accurate estimate of the cost for a specific B-Series VM.

B-series Vs. Dv3-series: How to Choose the Right Azure VM Instance?

It's important to take your workload's unique requirements into account when deciding between B-series and Dv3-series VMs in Azure. Both the B-series and the Dv3-series of virtual machines have unique features and performance traits that make them appropriate for various use cases.

Workloads that don't always demand the entire capability of the CPU can choose B-series VMs because they are a more affordable alternative.

These VMs are ideal for applications with erratic CPU usage patterns because they are designed to be cost-effective and offer the capacity to burst CPU performance when required. 

On the other hand, workloads requiring steady, high CPU performance are catered to by Dv3-series VMs.Compared to B-series VMs, they provide more vCPUs, more memory, and quicker disc performance.

Demanding workloads including production databases, massive data processing, and high-performance computing are suited for VMs from the Dv3 series. 

The Azure pricing calculator can be a helpful tool for calculating the price of various VM configurations and assisting you in making an informed decision.

What Are the Pros and Cons of Azure Burstable VM? 


  • Cost-effective.

  • Flexible CPU performance.

  • Scalable.

  • Seamless integration with Azure services.


  • Limited CPU performance compared to other VM types.

  • May not be suitable for demanding workloads.

  • May not provide the necessary level of performance for certain applications and use cases.


In conclusion, if you're searching for a cost-effective solution for workloads with variable CPU utilization, Azure Burstable VMs can be a great option.

They provide scalability, versatility, and easy integration with other Azure services. But keep in mind that they might not offer the performance you want for demanding applications.


How Many Cpu Cores Should a VM Have?

The number of CPU cores a VM should have is determined by the specific needs of your tasks.

How Many VMs Can I Run with 4 Cores?

The number of VMs that may run on four cores is determined by the CPU requirement of each individual VM.

A 4-core computer can operate several VMs, however, the number depends on the CPU demands of each individual VM and the total amount of CPU resources available.

How Many VMs per Host Is Too Many?

The number of virtual machines that can run on a single host is determined by various factors, including the host machine's characteristics, the VMs' CPU and memory requirements, and the available network bandwidth.

What Are the Alternatives of Azure VM?

AWS EC2, GCP Compute Engine, VMware vSphere, physical servers, containers.

About the author


Youssef is a Senior Cloud Consultant & Founder of

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