In a 4+1 (or any VRM with a +) VRM config, I think that the 4 go to the CPU, but I don't think that the extra 1 (or any other number after the +) goes to the CPU. I'll have to check.
i believe i unwittingly used a poor example:
on boards without support for an igpu (P67) it would be 4+1; 4 to the cpu and 1 to the memory IC. on boards with igpu support (Z68/77, H67/77, ect.) it would be 4+1+1 or 4+2; 4 to the cpu and 1 to each the IC and igpu.
though i think we can all agree the more phases, 8 as opposed to 4, the better stability to overclock.