The DZ77RE-75K is near identical to the DZ77GA-70K, although we spotted at least one change beyond the Thunderbolt port. On top of that, it's also quite an expensive motherboard, more so than MSI's Z77A-GD80 as vrzone reports:
So the major difference between the DZ77RE-75K and it's more affordable sibling, the DZ77GA-70K is the inclusion of a mini DisplayPort connector which is also the standard interface for Thunderbolt and of course the Cactus Ridge Thunderbolt chip. Sadly Intel cheaped out on it first Thunderbolt motherboard and used the DSL3310
