Is Hyper-V more scalable than Virtual Server 2005 R2?
—Yes. Hyper-V runs on 64-bit hardware and it supports virtualization hosts with up to 2TB of RAM and VMs with up to 64GB of RAM. This is far above Virtual Server 2005 R2’s limit of 3.6GB of RAM per VM. In addition, Hyper-V supports VMs with up to four virtual CPUs; Virtual Server 2005 R2 is limited to single-processor VMs.