Thanks guys very much for your replies.
You gave me some useful pointers to start to dig from.
I already read about daballiemo experience about KVM, but the problem is that my core is equipped with an Athlon 64 X2 dual core (939 socket) that don't support AMD-V.
So unless I'm missing some important bits KVM is not an option, because as budget is pretty tight I'd prefer to avoid any major expenses for core, and rather destinate money for extending my LinuxMCE actual capabilities.
I started to read about XEN, that seems to support PCI-passthru without AMD-V or any special hw requirement. If anyone can give me some hint on this, I'd really appreciate.
As I'm writing I'm downloading XEN LiveCd, so I will give it a real try and maybe report back here.
@daballiemo: just out of curiosity: why are you saying that your core is impossible to use as hybrid? Is it just because it is lying on a inaccessible site, or is it because KVM installation does not allow it?
Thanks again to all