Paul M. Cook wrote:

Dedicated video RAM is slower than DDR2 RAM as it uses the
restricted PCI bus speed

PCI video cards are long gone, it's years they're all on the north bridge
thanks to the AGP port.
Moreover:
1) the RAM mounted on video cards is way faster than the system RAM and with
a superior bandwidth
2) it is directly connected to the GPU so the GPU-to-video-memory path is
shorter, thus quicker
3) a video card using it's own RAM doesn't slow down the whole system as
integrated video cards (using system RAM) do

--
Vilco
Think pink, drink rose'