Looks like this motherboard has been getting quite a workout lately, but why mess with success? Go see the folks at amdmb.com and see what they thought of the IWill KK266Plus Motherboard. here's a snip:
"Overclocking on all Iwill boards is a dream come true for most hardware enthusiasts! Offering every option to be edited in the bios (with the exception of the 100 MHz / 133 MHz jumper), Iwill has made a name for themselves in the overclocking arena. The KK266Plus does not break this tradition. Pushing upwards of a 170 MHz FSB on an underclocked Athlon 1.4 GHz, this easily beats the best I have used before hand. Of course, to get speeds near this, you have to have some kick ass SDRAM, such as Corsair's. Overall I was able to push the Athlon Thunderbird 1.4 GHz to a great 1.65 GHz with air-cooling. Several other motherboards have reached this speed, but not 170 MHz FSBs!"