I've got an X48-DS5, which is essentially the same board, minus the 'crazy-cool' thingie on the back, and the X48 is a ripper, but I can guarantee you - that's a 775 socket on there! No i7s, no i5s...
I'll back balbat and RetiredChief up here. There is no way to fit in i5 or i7 chip into a LGA 775 socket. The GA-X48-DQ6 will NOT run an i5 or i7 chip.