Booh,
What specifically is happening to you? I'm interested in learning more about the nature of your problem because I just bought the same board from the same company, and my system isn't working ideally either.
Here's my deal: I run a Duron 850 off the KK266-R with 256MB of Corsair PC150 SDRAM on one DIMM. I planned to overclock, so I unlocked the CPU; it was tough, but I think I did a clean job. But any time I start the computer up with the FSB jumper on the 133MHz+ pins, the thing won't POST. It starts, it spins up the hard drive, checks the floppy drive, but it won't initialize the display or finish booting. I've tried just about everything I can think of to make it work at 133Mhz FSB: Slowing the RAM timings (always remembering to set the memory bus to "Host Clk"

, taking the multiplier down ahead of time, jacking up the core voltage, and repeating all of these steps on three different versions of the BIOS... None have worked.
So if your system acts like mine does when the 133MHz FSB is enabled, either we're both idiots or we're entitled to get our money back. Any other Iwill customers out there having the same bad trip?