i've done it!!!
+ the vtt mod and the vdimm mod...
i haven't gained a single mhz from doing it...
i think part of the problem is being able to find a suitable bios..
people report being able to hit 220 mhz pre-mod / pre-beta-bios...
then post mod, they'll still be stuck at 220 mhz but then change to a new beta bios and hit 240 mhz...
i haven't found that magical bios for me yet
i've tried a modded tictac bios d10 and another d23 rev 1 fire bios and still stuck at the same spot.
some people don't even do the vdd mod and still hit 240 mhz but with the right bios.