Systems with Intel’s Ivy Bridge, Ivy Town, and Haswell processors (E5 v2/v3 and E7 v2/v3) may experience random system crashes. To assist, Microsoft has release a microcode update for the Intel processors to improve the reliability of Windows Server versions and resolving an issue with Hyper-V on servers that use the Intel Ivy Bridge, Ivy town and Haswell processors.
Currently, this hotfix is provided for Windows 8 (RTM), Windows Server 2012 (RTM), Windows 8.1, and Windows Server 2012 R2. The hotfix for Windows Server 2008 R2 SP1 is expected to be released in September 2014.
KB Article - http://support.microsoft.com/kb/2970215
Are you hosting virtual machines on VMware and experiencing this issue? As per VMware, please open a support ticket with VMware referencing PR #1178834 to log the issue. Previously, VMware had recommended implementing the configuration change documented in VMware KB #1036775. You may want to implement this change until you can verify that your hardware manufacturer has a BIOS/Firmware upgrade that addresses this issue. Once the BIOS/Firmware has been installed, you can revert the change provided in the VMware KB.
Reference: "Changing the virtual machine monitor mode (1036775)" -http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1036775