RemoteFx 3d Video Adapter does not appear in Hyper-V R2 2012

Despite you having marked the other answer as the correct answer, it is not correct. My Hyper-V host is humming along happily with an nVidia GPU the size of an acme brick in its 4U chassis.

Hyper-V does support some 3D graphics cards. RemoteFX requires a 3D card in fact. The list of supported cards is evolving every day.

You're facing a hardware/driver incompatibility, you might try making sure all your drivers are up to date, but maybe you're just running an unsupported combination of hardware right now.

Edit: Here is the small list of "Supported, Tested, Microsoft verified" video cards for use with Windows Server:

http://www.windowsservercatalog.com/results.aspx?bCatID=1564&cpID=0&avc=10&OR=1

That doesn't mean that other video cards won't work, but those are the ones that've been tested by MS.

Edit: According to this MS article you also need SLAT enabled on your processor: http://technet.microsoft.com/en-us/library/ff817602(v=ws.10).aspx

In Windows Server 2008 R2 Hyper-V when using a single NIC and creating a Virtual Switch on that NIC, Hyper-V will create a virtual NIC that all of the networking components bind to and the physical NIC gets bound with the Microsoft Virtual Network Switch Protocol (which is the virtual switch driver). That shouldn't stop you from having normal network connectivity through the physical NIC.

In your case, the Hyper-V host and the Hyper-V guests will share the physical NIC. Make sure to check the check box on the Microsoft Virtual Switch that reads "Allow management operating system to share this network adapter".

That being said, at the very least you should have 2 network cards in the server: 1 dedicated for the host server and a second dedicated for the VM's.

I'm assuming all of the above is applicable in W2K12 and Hyper-V 2K12, or that it's very nearly applicable.

http://technet.microsoft.com/en-us/library/cc816585(v=ws.10).aspx