Azure virtual machines FAQ
Date Updated: 12 September 2017
The B-Series of virtual machines offer a cost-effective way to deploy workloads which burst in their performance, but don't require continuous full performance of the CPU. When B-Series virtual machines run in the low-points and are not fully utilizing the baseline performance of the CPU, the virtual machine instance is building up credits. When it has accumulated enough credit, you can burst your usage up to 100 percent of the vCPU for the period of time that your application requires the higher CPU performance.
These virtual machine sizes allow you to pay and burst as needed, so you use only a fraction of the CPU when you don’t need it, and can burst up to 100% of the CPU when you do (using Intel® Haswell 2.4 GHz E5-2673 v3 processors or better). This level of control gives you greater cost flexibility and value.
Learn more about B-series virtual machines.