So my question is, what happen when I put an unofficially supported RAM into a board? Does it work?
The MB Mfg. can not possibly test every release of every RAM available to consumers. If the G. Skill has the same voltage, speed and timings of other RAM on the support list, then chances are good it will work. If you really believe the RAM will be a problem running on a P55 chipset, email G. Skill and ask specifically if the RAM will work in the MB.