Enermax PSU, which PCIE cable to use?

Hi, I am building a new rig using an Enermax Infiniti but am confused as to which PCI-E connector to use. At present I am using the fixed cable which has a tag labelled Graphics and is a 6+2 connector. However I am getting crashes and reboots when playing games. There are two modular red connectors marked PCI-E Master an Slave. Should I be using these or does it not matter? By the way, the video card is an XFX 8800GTS.
Thanks everyone.
Nick

Try the PCI-E master connector and see if this resolves the crashes, it's probably the one I would use.

You need to use 2 x 6 pin pcie connectors. Any of them will do.