670 SLI and 3.o question

[mikejustis]

Hi All, I just installed my 2nd 670FTW and enabled SLI. I placed the card in the x16 slot in the mobo but am showing I am not getting 3.0x16 speed. I am getting 3.0x16 speed on the top one though. Do I have to run the "fix" again? Here are the pics from gpuz

[PlaneName]

What is your motherboard? I'm positively sure only the primary slot has the PCI-E 3.0. Then on the second slot is the PCI-E 2.0. I'm not sure, until we know what is your motherboard.

[mikejustis]

Its the Rampage IV Extreme. From the manual the first one is 3.0x16 then the next 2 are x8 then the 4th is 3.0x16 again.

[PlaneName]

That is normal. When running two GTX 670 the second one has to be PCI-E 3.0 8x (which is the same as PCI-E 2.0 x16 ). So if your running two PCI-E 16x slots both of them is halved to x8.

[cx-ray]

If you want x16 for both cards use slot 1 and 4 (first and third red slots). For PCIE 3.0 you have to either apply the Nvidia fix or manually apply it on each card individually in the registry.

[SUKARA]

About this you can reference motherboard manual page 2-10...

by the way,the performance difference PCIE2.0 and PCIE3.0, benefit the clock PLL improvements, and some growth, but increased less than 1%, and grow into little micro. The current high-end GPU like HD7970 or GTX590 or GTX670 even PCI-E 2.0 the X8-channel (4GB / s) are difficult to fill up.

[R4E3960X]

SUKARA@ASUS wrote:
About this you can reference motherboard manual page 2-10...

by the way,the performance difference PCIE2.0 and PCIE3.0, benefit the clock PLL improvements, and some growth, but increased less than 1%, and grow into little micro. The current high-end GPU like HD7970 or GTX590 or GTX670 even PCI-E 2.0 the X8-channel (4GB / s) are difficult to fill up.

Yes, This is true. 😄

[mikejustis]

Thanks for the responses. I applied the fix again, re-installed the drivers and restarted and it was fixed.