[Algorithms] Capturing Framebuffer

[<gae...@la...>]

Hello,
I'm trying to improve my DX9 Engine with a video file recorder.
I want it to be as fast as possible (faster than real time if able).=20
Several years ago I was confronted to this problem with a rendering =
based
PVS system. At that time my best solution was to write a memcpy using =
movaps
from AGP Memory to System mem but I'm sure there is faster solutions, =
FRAPS
for example is doing great.
So the basic question is: "how should I transfer my render target to =
system
memory".=20

And I have a second question, when I'll have my solution, how will =
Hardware
impact on capture performances. ATI or NVidia? GDRAM Frequency is =
important?
RAMDAC? Chipset? I'll have to assemble the perfect machine for frame
capturing so these questions are also important

Do you have any ideas?
Ga=EBl.