I reset my bios and it still says x8.

There's only one bios for the SLI 3, and thats 74 I believe.
I've got C2RC5 as the bootloader and graphicsenabler=yes (no strings or anything)
I'm not using the DSDT from page 24, but I suppose I'll give it a try.
I've got these extensions in /E/E
AHCIPortInjector
fakesmc
IOAHCIBlockStorageInjector
JMicronATA
NullCPUPowerManagement
OpenHaltRestart
PlatformUUID
SleepEnabler

and then in /S/L/E I have VoodooHDA

Everything else is stock. I had a firewire card in the third x16/x8 slot at first, but I took it out and like I said it still says x8 after resetting the bios too. No other cards installed. I'll give that page 24 DSDT a shot.