[Pierre-Marie Baty]

bah, integrated GFX cards such as the Intel i810e (on my former motherboard) also use the system memory, and they must send data back and forth onto the main bus for that... and it never prevented me to watch any video or to experience any form of stutter in them...

And nowadays PCs are so fast it is completely possible (and IMO that's how most things will be done) to decode, render and deinterlace video directly into the video memory, kind of what VESA used to work on our old 386s... who needs proprietary hardware cyphers ? Nowadays our DivX are almost of DVD quality ; getting a pixel-wise accuracy on video is pointless IMO.