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what would be the best graphics plugin for my setup:

amd phenom 8750 x3
amd 4830 video card
4gb of ram
windows xp (i also have win7 if that makes a difference)

gsdx9 for most games.

GSdx is the most compatible GS plugin currently.
latest version in it's thread:
http://forums.pcsx2.net/thread-3031.html