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You dont need to. Just leave it at AUTO. In OS enable the Nvidia Force gen 3 patch which forces gen 3 at driver level. This is the only way to get gen 3 working with an Nvidia 6 series GPU on the X79 platform.
When I say I get no display, I mean I don't even see the POST screen when the PC turns on. The monitor just goes into standby mode without displaying anything. If the Num Lock, Caps Lock and Scroll Lock LEDs on my keyboard flash and there's no picture I know its gone wrong. A reset will often fix this, although not always.
I also don't remember there being a AUTO setting, just GEN3, GEN2 and possibly GEN1.
When I say I get no display, I mean I don't even see the POST screen when the PC turns on. The monitor just goes into standby mode without displaying anything. If the Num Lock, Caps Lock and Scroll Lock LEDs on my keyboard flash and there's no picture I know its gone wrong. A reset will often fix this, although not always.
I also don't remember there being a AUTO setting, just GEN3, GEN2 and possibly GEN1.