Answer

No, 12VHPWR to 2xPCIe 6+2pin cable is for adding extra 2xPCIe 6+2pin power connectors, the 12VHPWR end must be connecting to PSU.

Models

MPG A750G PCIE5, MEG Ai1000P PCIE5, MPG A850G PCIE5, MPG A1000G PCIE5