My motherboard supports AGP 4x. When I have it set to that, I get a huge amount of screen corruption. If I restrict it to 1x everything looks good. Performance wise, I don't see any difference between 4x and 1x. Don't worry if you only have AGP 4x, its more than enough to play games.
By the way, I have a GeforceFX 5900XT, 512MB of memory, and two Athlon XP 2400+ in my computer. Though I haven't played some of the latest, most graphic intensive games, it works well for everything else.
(I may not agree with thoughts posted under this name)
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