I see little to no difference between those two. I can't see it worth any possible hits or compatibility issues

Quote Originally Posted by JohnZS View Post
BETA 4 has been released!!!
This does support FXAA in GTA IV, however there are some graphical issues and some problems with the lighting.
You can download BETA 4 here
Some Dude is working on this at a rate of knots..

GTA IV NO FSAA
http://www.abload.de/img/gtaivnoaadodz.png

GTA IV FXAA BETA 4
http://www.abload.de/img/gtaivbeta4tq4u.png

John