If you look closely, you'll find several more VRMs on the 5970
first the obvious ones:
VRM1 area = VT1165 + 3 slaves, GPU1 VDDC (i2c slave addr 0x70 on gpu1)
VRM2 area = VT1165 + 3 slaves, GPU2 VDDC (i2c slave addr 0x70 on gpu2)
the square chip at the top/right of vrm2 area = another vt1165 controller, belongs to the 2 slaves above the VRM2 slaves, it's a 2-phase providing both GPUs VDDCI (i2c slave addr 0x71 on gpu1)
now, there's avolterra integrated controller (vt237) top/right of the 1 of "VRM1"
and another vt237 under the R of "VRM2"
I suspect those 2 guys are our memory VCC (one for each GPUs memory?).
now on to the non-volterra stuff
a AOZ1024D above the VDDCI inductors and output caps... no clue.
the 2 FETs below the GPU2 memory chips/left of the suspected GPU2 memory VRM, controller is a uP6101 on the backside ... again, random aux supply.
that should be it for major switchers, there's probably another 3 or 4 linear regs strewn about...