Microsoft released a hotfix that includes a microcode update for Intel processors to improve the reliability of Windows Server. It affects Windows Server 2012 R2, Windows Server 2012 and Windows Server 2008 R2 Service Pack 1 (SP1). The fix also solves a reliability problem for Hyper-V running on Ivy Bridge, Ivy Town, and Haswell processors.
A supported hotfix is available from Microsoft.
Note hotfix for Windows Server 2008 R2 SP1 will be available in September, 2014.
This update reminds me of a similar update that was released soon after the RTM of W2008 R2 to deal with issues in the Nehalem CPU. Without the fix, there were random BSODs. I got tired of telling people, so called expert consultants, to install the fix. Note this fix, test it if you want to deploy immediately, or wait one month and then install it. But make sure you install it – set something in your calendar NOW to remind yourself.