I have both a Quadro 5000 and Tesla 2050 installed (Windows 7). I am trying to use the Mercury Playback Engine in Première Pro 5.5. Première Pro supports the Quadro card, but not the Tesla. I have tried using the Nvidia Control Panel (Manage 3D settings - Program Settings) to set Première Pro to only use the Quadro Card, but the Mercury Playback option is greyed out. If I use the Windows Device Manager to deactivate the Tesla card, everything works as expected in Première Pro. I’m wondering if this is a problem unique to my PC, or if there might be an issue with the Nvidia Control Panel.