It should be noted that AGP8X isn't really a necessary performance boost, especially with 128 and 256MB cards. The only data that has to traverse the AGP bus is the textures when they're first loaded, and then a steady stream of instructions. When AGP8x came out, most hardware reviewers concluded that the extra bandwidth created only marginal improvements in framerates. This is the same thing that happened with ATA133; most drive manufacturers never picked it up since ATA100 drives worked just as fast as ATA133 ones.
Unless you're getting noticeable performance degradation, I wouldn't fret about it.
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