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HI @ all, <br />
<br />
Is there a problem, if I assign an additional CPU on a productive virtualized Windows Server 2012 R2? (virtualized with vSphere 5.5) <br />
I know there were different problems with Windows Server 2003 and 2008. <br />
<br />
Thanks for your help.
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HI @ all, 

Is there a problem, if I assign an additional CPU on a productive virtualized Windows Server 2012 R2? (virtualized with vSphere 5.5) 
I know there were different problems with Windows Server 2003 and 2008. 

Thanks for your help.

Windows server 2012 R2 assign additional CPU on demand support

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.

Windows Server 2012

VMware, a software company founded in 1998,  was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies.

VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture.  Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.

VMware

Virtualization is the act of creating a virtual (rather than actual) version of something, including (but not limited to) a virtual computer hardware platform, operating system (OS), storage device, or computer network resources. Virtualization is usually the creation of a system that executes separate from the underlying hardware resources, or the creation of an entire desktop for systems located elsewhere, similar to thin clients.