In the following link below you will see a table containing: Direct Cabling Connectors, for reference.
It lists two non modular pci-e connectors, both on different rails, they are the connectors of interest.
From what I understand the Gigabyte GTX670 Windforce OC requires both 8 and 6 pin pci-e power connectors. Having said that, I NEED to use one of the non modular 6+2 connectors, the question is should I use the other non modular connector, which is on a different +12v rail.
Is 25amps (300watts) enough to power a single Gigabyte GTX670 Windforce OC at full load.
Is it ok to mix the two separate rails that are non modular? For example, connect both rail 3 and 4 to the graphics card?