So a little background... I have a Radeon 5870 (Apple OEM) on my 2008 Mac Pro. I have apps that want an entire gig of VRAM to themselves for a single display, and I run two displays. So I need a second card to run a second display. I have been using a GeForce 120. It had been working great up until Lion. Now, with the GeForce 120 in the machine, I get severe performance degradation (Frame rates down by about 2/3). When I take it out, everything is fine. Are there any alternatives? I'm getting tired of this issue. As far as I know there aren't any ATI cards of similar power that don't require power leads.