"Although P67A-UD5 isn't the highest-end product in the series, we believe it's the most reasonable high-end solution. Those who need the most will surely prefer P67A-UD7 with its full-speed PCIe x16 slots, additional controllers and steep price. Regular users will choose simpler models, like P67A-UD4 and cheaper."
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips