Reply 16160 of 29616, by darry
Agreed that 133MHz FSB on a 440BX is overclocking . That said, my 440BX based P3B-F 1.03 is stable running at 133MHz with an FX5900XT , as are many other P3B-F boards .
The Abit BX133 was obviously marketed as being 133MHz capable and I doubt they had to resort to binning chipsets.
My guess would be that 133MHz FSB on the 440BX chipset itself just works, even if out of spec, and that stability issues on certain boards are implementation dependent .