so it depends on how many clients you have, but plex usually recommends atleast 2000 passmark per stream(if you are transcoding) you want to have going at a time.
Purchased this card in Feb 2013 and used it sparingly since I got 670 a few months afterwards and this just sat in my backup pc.
I have all the original packaging for it, asking for $100 shipped. Paypal payment only.
I will post pictures tonight when I get home.
link to specs...