3D Mark 2001 and SiSoft Sandra
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Again, the KD266 falls ever so slightly behind its KT133E competitor. VIA seems to have done a good job of tweaking the chipset for performance. As close as all these tests show the two boards, its very possible a more mature bios, on either side, could greatly tip the scales.
The memory tests are pretty close here as well. In the ALU category the KT133E edges by with a 2% difference and on FPU results we get a 6.5% difference. This is fairly typical of the ALi chipsets, even the M1647 motherboards, having slightly below average DDR and SDRAM scores.
The SiSoft CPU benchmarks show the two motherboards incredibly close, giving the edge just barely to the KT133E chipset. The difference in the numbers you see there are much to minute to see any real difference.