look the Premiere Pro CS4 what you have x64 or x32 bit?
I have Windows 7 Home Premium 64bit.
I have installed the latest nVidia drivers for the Quadro FX1800.
This only happens when I am working with Premiere Pro cs4.
I also have a Matrox MX02 Mini for outputting to an HDMI monitor, so I set up Projects using the Matrox Presets. When I set up a non-Matrox Project the video runs smoother, but most things like simple Cross Dissolve transitions and using key frames to fade in or out require rendering.
rather my friend is to blaim something in the connection (hdmi etc.) with the matrox and with card of sound that it makes rendering real time….in any case your card graphic is not to blaim. It tryed also some other program rendering you see what is to blaim finally