P4 2.8ghz HT, 1.5gb, 160gb HD, Ati Radeon 9550 256mb AGP 8x

In Personalize, display settings, advance settings it display that i have:

Total Available Graphic Memory 767 MB,
Dedicated Video Memory 256mb
System Video Memory 0MB
Shared System Memory 511mb

Does every Video card use shared system Memory? I thought by buying 9550 it
would not use my computer memory but in the dispaly setting, advance setting
is showing Shared System Memory 511mb, is this normal on all video card. Any
recommendation on video card that does not uses computers memory? How about
Visiontek Ati Radeon X1300 512mb AGP 8x?
[url]http://www.visiontek.com/products/cards/retail/x1300_512agp.html[/url]