Hi BambiBoomZ,
I have my M2090 powered with only one of the two 6-pin PCIe power leads.
One 6-pin PCIe auxilliary connector is plugged directly into the Quadro K4200 6-pin socket.
The other 6-pin PCIe auxilliary connector is plugged into the Tesla M2090 via a 6-pin to 8-pin adapter cable. i.e. The M2090 does not require power on both sockets.
