"When we refer to overclocking with the KT133A chipset in this review, we are actually referring to how high we can push the VIA KT133A chipset over 133Mhz before it finally gives way to memory or heat limitations, lowering the clock multiplier in conjunction with raising the front side bus frequency. So how high were we able to push the KK266's North Bridge? To the roof baby. All the way to 166Mhz, which offers a nice 26.5% increase in memory bandwidth over the officially supported 133Mhz FSB frequency."
FULL STORY @ 3DRAGE (http://www.3drage.com/hardware/motherboards/kk266)