With the SLI setup, I set the Internal Graphics Device from "Auto" to "Enabled". Windows 8.1 took longer than usual to boot, and eventually my login screen appeared.
In Windows 8.1: Checking Device Manager showed both of my 750's and a generic "integrated graphics." I downloaded the Intel 4600HD drivers from Intel's site and viola, I had all 3 GPU's at my disposal. I ran ArmA 3 just out of curiosity and noticed terrible frames and beyond sluggish performance. I viewed my Nvidia Configuration and noticed SLI was not enabled. I tried enabling it, but the config would revert immediately back to disabled. I did no further investigation due to lack of free time.
In Debian 8 (Kali Linux 1.1.0a): Debian would not run gdm3 (the display manager, GUI) or the CLI at all. Well I shoudn't say it didn't RUN it, it just didn't display anything. I believe it was the xorg.conf (I installed Debian prior to knowing of Optimus, learned how to use one Nvidia gpu for Pyrit in the link below), it was not configured to display with the integrated graphics. I reinstalled Debian 8 with the integrated graphics enabled, the Intel Display Controller was now recognized by Debian. The OS loaded some sort of generic driver for it (I believe it was pipeline). Both 750s were recognized also, but not being utilized to my knowledge. Intel currently does not have support for the 4600HD in Debian, so I could not install any official drivers for the integrated graphics. Everytime I tried installing Nvidia drivers from there, **** hit the fan. I do not know how to set up the config files to utilize all 3 GPU's, but the point is Debian does recognize them. When I get some free time (I'm in the Army so I don't get much) I will be researching more into Bumblebee and hopefully will learn how to configure my GPU's.
Here is the link I followed previously if anyone has any interest in utilizing their Nvidia GPU with Pyrit in Kali Linux. Great guide.
https://forums.kali.org/showthread.php?21956-%28Guide%29-Installing-Nvidia-Bumblebee-CUDA-for-Optimus-enabled-Laptops
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Fuzzilla, to my knowledge that is a no. You can backup your BIOS (I assume it's v3.08) and send the file to svl7, I'm sure he can tweak it. I was originally on v3.08 but downgraded to modified 3.05, I shoud have kept my backup of 3.08 to send myself but I didnt