As I understand it, Wunder, the issue is not voltage (the BH6 can supply 1.6V fine), but ampage.
Now, I know that the IWill Slocket-II has its own VRM on board, but still needs the mobo to supply 1.6V VCore. And I believe the Abit SlotKet-iii works along the same lines.
Which, truthfully, confused me a bit. If these two converters need the motherboard to supply correct voltage and ampage, then what do they have the VRM for? Maybe just to make sure the power is "smooth" enough for a Coppermine?