we've got a bunch of S2600GZ motherboards. They have 2 4pin 12V power connectors on the board. We have a custom card that needs external 12V, which we can make up ourselves, but we need to know the Part Number for the connectors for the OPT_12V_PWR's on the S2600GZ board..
Great motherboard it is (usually part of a system).
You can find the pinout in the TPS, or get cables only with the x16 PCIE risers (see config guide). Intel does not sell cables alone.
Another option is buying AUPLGPUBR and get 4 x cables.