Why does Windows 8 Hyper-V require SLAT?
Posted by essjae on February 6, 2013
Since Windows 8 is designed as a desktop/workstation or client OS, the requirement for SLAT makes a lot of sense for most users.
The lack of SLAT (Intel EPT and AMD RVI) was a big issue when using Hyper-V and a Windows 2008 (r1 and r2) system equipped with a high-end video card as a workstation (as opposed to a server). When 2008r2 became able to use SLAT, the video performance issues were just resolved.
VPC Guy Ben A has an excellent selection of blog posts on SLAT and Hyper-V.
Issue: Video performance may decrease when a Windows Server 2008 or Windows Server 2008 R2 based computer has the Hyper-V role enabled and an accelerated display adapter installed
http://support.microsoft.com/kb/961661?wa=wsignin1.0
Expanded explanation of why it happens:
SLAT resolution:
esSJae's Virtualization Blog 
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