SPECviewperf, Cachemem and ScienceMark
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The four tests I use on the SPECviewperf suite show varying results. First, the Light-04 test has a nice 7% gain with the KT333, while the Awadvs-04 test is fairly flat due to its dependence on the graphics card. The Drv-07 test shows the greatest use out of the memory bus by gaining more than 25% in score! The final test, the MedMCAD-01 test shows a less significant 2.5% increase. Overall, I would say the SPEC tests are able to get very good results out of the KT333 chipset.
Here we see similar results when comparing the two VIA chipsets. In the memory reading tests, the KT333 wins by about 15% while on the writing test all three competitors seem to fall flat with NVIDIA winning by only about 2%.
The ScienceMark tests do use the extra memory bus, but because the processor is so starved on this test, the results do not increase by more than a few percentage points.