480MB Max RAM in Hyper-V under Fusion5

I have a Win 2012 server running in my Fusion5 on a MBP with 16GB RAM

The VM has 8GB RAM

I added the Hyper-V role successfully.

I can open the Hyper-V Manager app.

When I try to create a new VM I can do it, but the max memory I can choose is 480MB.

Help?

(On a side note, does anyone know if it is a) possible, b) legal, to run an OSx VM in HyperV running on the Win2012 server in Fusion? I know it sounds crazy -- the idea is to be able to use a 'private' network)