Windows Server 2012 with Hyper-V provides you with massive scale to transform your datacenter into a cloud platform. Hyper-V in Windows Server 2012 greatly expands support for host processors and memory. It now includes support for up to 64 processors and 1 terabyte of memory for Hyper-V guests, a new VHDX virtual hard disk format with larger disk capacity of up to 64 terabytes, and additional resilience. These features help ensure that your virtualization infrastructure can support the configuration of large, high-performance virtual machines for sustaining workloads that you might need to scale up significantly.
Read about some of the key virtualization features in Windows Server 2012 with Hyper-V.