well i think i allready posted this but here it goes again, i have a week 41A 4300 and i use to have a biostar tforce 965pt and a asus p5b-d that i tried it on with my phase change cooling,

pre mod (the 266fsb mod connecting 2 and 5) on the biostar had a 400fsb wall no matter voltage under phase, anything over 400 was unstable or wouldnt boot, tried everything,
the p5b-d whad the same wall with the 0804 bios, 400 fine anything over going up to 450 (i tried) would not boot

solutions- for the asus without the bsel modd i tried the 0711 bios, it didnt recognize the cpu correct so it booted at 266x9 default, so now the max i could clock it was 462x9 with 1.58vcore, (remember this is onphase), the bsel mod would not work on the p5b-d but the old bios did work for me

now the biostar using the 119 or 103 bios or the 921 deluxe bios (all from rebels haven ) with the bsel mod had the exact same results of 462x9, it booted right upo at 266x9 and i clocked it up the same under phase

so it works with biostar but not p5b-d but the old 0711 bios works in the same aspect

good luck