Well now I've got the options of the following boards:
-Gigabyte G1 Sniper B7 (6th Gen)
-H97 Guard Pro (4th & 5th Gen)
-Gigabyte Z87 (4th Gen)
Any suggestions? Would love if someone can provide any idea about these in mining... Need the most power-efficient motherboard.
for the 3 GPU's any board above will do fine just do risers, however if I were you, I would consider future GPU additions, as for the power efficiency it will depend on your GPU settings and power supply, some sort of advise is that go for a higher efficiency and decent power supply.