Appears to no longer need use of the force gen3 application for PCI-E 3.0.

bdary
What GPU(s) are you running?

EVGA GEFORCE GTX 780 Classified (stock)
X79 Dark (Bios 2.05)
i7 4820k (stock)
Corsair Dominator Platinum 16GB (4x4) 2400Mhz 9-11-11-31 1.65v
EVGA 1000 G2

fegdenmark
Ah, finally. Any idea if their Linux drivers get the gen3 support as well ... ? Or is there a tweak available like force-gen3 tool on Windows? like e.g. a xorg.conf entry...?

I put a support ticket in with NVIDIA for this last year and they came through with a new module parameter that enables GEN3 for x79 / LGA2011 platform.
 
rmmod nvidia 
modprobe nvidia NVreg_EnablePCIeGen3=1 
 
This parameter was added with driver 313.09 on  2012-12-11.
 
As for having GEN3 support enabled by default with IB-E, I am not sure when that will happen. Also, the first Linux driver released for the GTX 680, 295.33 enabled GEN3 by default with LGA2011. This driver does not have support for any of the newer cards post GTX 680.

linuxrouter
I put a support ticket in with NVIDIA for this last year and they came through with a new module parameter that enables GEN3 for x79 / LGA2011 platform.
 
rmmod nvidia 
modprobe nvidia NVreg_EnablePCIeGen3=1 
 

...you're the man, linuxrouter! Thanks so much, that driver option did it for me. Now running two Titans with Linux driver 319.49 and PCIe3.0.
 
btw, since you seem to have a profound knowledge about that stuff, I have another rig for crunching (dual xeon 2690 on Z9PE and dual GTX690). With the GTX690 and the same Linux setup as on the Dark I had PCIe3.0 from the very beginning, no driver options needed.  Any idea whats the reason for that? C602 chipset more advanced, or because there are PLX chips on the 690s ? Just being curious.
 
 
 

fegdenmark
...you're the man, linuxrouter! Thanks so much, that driver option did it for me. Now running two Titans with Linux driver 319.49 and PCIe3.0.
 
btw, since you seem to have a profound knowledge about that stuff, I have another rig for crunching (dual xeon 2690 on Z9PE and dual GTX690). With the GTX690 and the same Linux setup as on the Dark I had PCIe3.0 from the very beginning, no driver options needed.  Any idea whats the reason for that? C602 chipset more advanced, or because there are PLX chips on the 690s ? Just being curious.

 
You're welcome. Glad to hear module parameter worked with your Titan's.
 
As for the GTX 690, this card has the PLX PEX8747 switch that the GPUs and CPU connect to. I believe the NVIDIA drivers see this particular chip as a valid certified PCI-E 3.0 controller so that PCI-E 3.0 is enabled by default. The PLX chip should hopefully negotiate PCI-E 3.0 link speed with the CPU as well. The way to tell for sure would be to download the NVIDIA CUDA toolkit and run an included sample application called BandwidthTest. If the 690 is installed in a PCI-E 3.0 x16 slot and if GPU to PLX and PLX to CPU have negotiated at GEN3 than your cards should see bandwidth in the range of 12-13 GB/s in each direction as reported by this application. On a side note, the E5-2690 is actually listed as supporting PCI-E 3.0 by Intel but NVIDIA choose not to enable support by default which is the same as we saw with the desktop SB-E processors.