Both the Gigabyte GA-Z68X-UD7-B3 and G1.Sniper2 are IMO rip-off's to 99.99% of the Enthusiasts out there and the 'doodads' of the G1.Sniper2 help very very few.
I noticed your Corsair H100 post so my assumption is OC is your 'goal' and the best (2) Gigabyte MOBO's for the $-to-OC are Gigabyte GA-P67A-UD7-B3 and GA-Z68XP-UD5. Regarding Phases - yep to a point, if effectively used, do aide in lowering the vCore which lowers the CPU temps to better achieve a stable and obtainable high CPU OC. The returns are very diminishing with 12 Phases and higher.
The 8 Phase Gigabyte G1.Sniper2 would concern me if >4.5GHz is your 'goal' OC.