This nVidia Quadro is a BRAND NEW AppleCare videocard upgrade (!) and replacement only last week for my original ATI card in my Mac Pro . I have the paperwork to prove it. I currently have it installed and is working fine.
If you want a Quadro in your Mac Pro for a good price, make a fair offer I can't refuse. It is a powerful card, but I wouldn't be able to use it for what it was designed for.
EDIT: price is approx. $800 on ebay, I will sell this new card for $500 U.S.
Help this Quadro fulfill its destiny...