Ran a Duron 750 in an Abit KT7A board at 133x7.5 or 998Mhz.
2/2001 CPU, (forgot week) Only needed to connect L1 bridges. No other mods needed.
Using 133fsb no longer gives the option for memory to run at FSB+PCICLK, so memory is at 133MHz. PCI/AGP is at 33/66Mhz.
Also ran 140x7 or 980 MHz. This bumped up the memory and bus a little more.
But, sorry to say, 133Mhz is more of a gimic with normal AMD's. Perhaps the latest AMD's designed for use with the 133MHz FSB, will support better overclocking to around 150+ fsb. As it currently stands, my system using 112x9, or 1008MHz, runs everything much faster, and scores higher in all benchmarks, compared to 133 and 140fsb. The lower 112MHz fsb gives me the option of running memory at 112+37, or 149MHz, and with quality PC150 ram available cheap now, running memory at anything less than 145, is defeating it's purpose. Also, the 133MHz fsb uses a 1/4 divider for PCI, while the 112MHz fsb still uses the 1/3 divider. So, even at 140 fsb x 7, CPU would be at 980MHz, memory would be at 140, PCI at 35, AGP at 70 (280 using 4x AGP), and IDE would be at ?. Compare that to 112 x 9, and CPU is at 1008MHz, memory at 149MHz, PCI at 37, AGP at 75 (300 using 4X) and IDE would be faster as well. At the most, this 112 is still only overclocking everything by 12% max, which any system should be able to do.