Sadly, there are still some drawbacks with those old cards.
- You cannot get True HD audio passthrough
- DXVA is older and not as complete as in the new one
From what I understood from this thread, AMD series 2,3 and 6 seems to work with DXVA where the serie 5 don't.
I will manage to buy a HD6450 to see if my guess is correct, if it works it may be an excellent and inexpensive card.
According to the patchnote, some good is also to be expected from the upcoming version 5 of vsphere.
