While AGP 4x with its 266MHz offers a maximum theoretical bandwidth of about 1.1 GB/s, 8x allows for twice as much data to be pushed across the bus, namely 2.1GB/s. Additionally, there are now several new side-band addressing modes as well as an "isochronous operation" mode, which ensures maximum available bandwidth regardless of system load. This could prove a very valuable addition for video streaming and similar applications. Games, however, aren't nearly as demanding, making this a moot point for gamers.
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