I have the same configuration but it's impossible de boot with the GT640 inside, i only have the grey wheel during a long time (more than 25 minutes, i stopped after).
I try to boot with GraphicsEnabler=0, -x one of them or both, but the result is always the same, the grey wheels on light...
Sucess: Mountain Lion Gigabyte GA-Z77-DS3H, i5 3570k Ivy Bridge
I have the same Motherboard, the same CPU, the same memory.
I use the Unibeast 1.5.3, I use Multibeast 5.1.3
The only change is that i have a Nvidia 640 cards.
I could'nt restart my computer after the Multibeast...
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