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X79 (Nvidia) PCI-e 3.0 Reg Hack

GoogalyMoogaly

GoogalyMoogaly

GoogalyMoogaly

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I was just wondering if anyone knows the Registry hack you need to do in order to get the PCI-e slots running at 3.0?

I'm just wondering if it helps any (assuming when Gen3 is enabled in my BIOS the monitors actually come out of standby...)

I know there's an exe but I'd prefer to do it manually so I know what to undo if it doesn't work and actually causes problems.

Also I seen reports of some people having issues with games complaining about Direct3D components, if I got this would dropping down to PCI-e 2.0 i nthe BIOS solve it or would I need to undo the registry change?

Thanks.
 
Yeah, apparently the undo function doesn't always work though.

Hence why I wanted to know the manual way of doing it (as apparently the exe only does the reg hack anyway) so I can undo everything I did, instead of hoping -revert works and being left with an even bigger mess of a system than I have now if it doesn't.
 
Does that mean your R4E also sometimes boots but doesn't display anything and the monitors don't even come out of standby? Unless you set the PCI-e slots to Gen2.

(Tried this with 3 different graphics cards by the way, so doubt it's them)

EDIT: Just trying to establish if all R4E's behave the same.
 
I'm assuming that 690 Quad SLI example had 2 PCI-e slots runnign at 16x?
If using individual cards the speeds of the slots will drop to 8x.

I ran my 670 SLI at PCI-e 1.1 and PCI-e 2.0 16x and noticed a 10% difference at 1080p (~3300 @ PCI-e 2.0 and ~3000 @ PCI-e 1.1)
 
Kaapstad said:
@PCIe 2.0 you are still @16/8/8/8 the number of PCIe lanes do not change only the bandwidth going from PCIe 3.0 to 2.0
Click to expand...

I'm guessing he meant effectively running at 8/4/4/4 because PCI-e 2.0 is about half the speed of PCI-e 3.0.
So if you run 4 cards at PCI-e 2.0 speeds you would effectively be getting 8/4/4/4 PCI-e 3.0 speeds.

The question is would a 670/680 (or 7950/7970) hit bandwidth issues if running at PCI-e 3.0 4x. I think even your tests show you would as I believe PCI-e 3.0 @ 4x is the same as PCI-e 1.1 @ 16x.
 
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