P35 with 5770?

get the 2.0 version of the card, avoid the 2.1 cards

How do I know if it is a 2.0 or a 2.1?

it will say PCI-Express 2.0 or 2.1 in the title description like this 2.0 card

http://www.tigerdirect.com/applications/SearchTools/ite...

It seems like they are almost all 2.0 yet many people have had issues with these cards. Have you had any experience using these cards on a 1.1 interface?

EDIT: I just won't want to buy a card and then have it sit there because it is incompatible with my current setup