PC Stats has posted an article on VIA's KT333CE Chipset 3D Performance

Since the introduction of the KT333CE chipset there have been some strange benchmarking results cropping up which are hard to explain. In a broad number of 3D oriented benchmarks, at higher bus speeds, VIA's KT333CE chipset seems to be performing consistently slower than the older VIA KT266A chipset. After a few late nights discussing this with VIA directly, we have come to believe that these peculiarities are due to the introduction of the 2/5th AGP divider.

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