Having problems with SLI

tenderous · Apr 1, 2014

Hello I am trying to SLI 2 GTX 660s. One is EVGA and the other one is PNY. I cannot enable SLI, because in the NVidia control panel, it says I have to connect them with an SLI bridge, even though I already connected them. I even bought another bridge and it still doesn't work. I also tried putting the cards in different slots, but still with no luck.
System specs:
i7-4770k 3.5 Ghz
8gb patriot 1600mhz
Z87-A motherboard (supports SLI)
650 watt power supply

clutchc · Apr 1, 2014

Are both cards identical as to memory, clock speed, etc?
Have you tried uninstalling the driver, re-booting and re-installing the driver (w/both cards in place)?

tenderous · Apr 1, 2014

I don't know how to tell the clock speed, but they are both 660s. However, the EVGA one has 2 fans.
In, the meantime, I'll try reinstalling the drivers.

tenderous · Apr 1, 2014

Just finished reinstalling drivers, still no luck.

clutchc · Apr 1, 2014

Here are the requirements for successful SLI. Check it out: https://forums.geforce.com/default/topic/469402/
List the models of the two cards and I'll see if they have the necessary VRAM and Buss width to be compatible.

tenderous · Apr 1, 2014

The PNY 660 is this one: http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4809393&CatId=7387
The EVGA 660 is this one: http://www.newegg.com/Product/Product.aspx?Item=N82E16814130967

I checked out the page, chcked my hardware, and it is all compatible with SLI.

clutchc · Apr 2, 2014

The core clocks are different on the two cards. Normally, the fast clock should slow down to match the slow clock so they can sync in SLI. For some reason, your EVGA may not be doing that automatically. Can you manually adjust the EVGA card's clock to match the PNY's?
Evga Precision should allow you to do that if you don't have another method: http://www.evga.com/precision/
Once you get the clocks the same, let EVGA Precision keep them like that even after booting by making it a permanent profile that loads w/boot. Then try again to get SLI to enable. You may have to do another driver re-install.

tenderous · Apr 2, 2014

It says in precision that the core clocks are already the same, but voltage is slightly higher in the EVGA card than the PNY.

clutchc · Apr 2, 2014

tenderous :

Did the faster one slow down to match the slower one... or vice-versa? If they are now running at the same clock speed, it sounds like SLI is enabled. If not, the cards would run at their own different clock speeds.
Can you post a pic of your Nvidia Control Panel tab that shows the SLI page?

tenderous · Apr 3, 2014

There is still no option to enable SLI even when they are the same speed.
Here is a screenshot of the control panel: https://imageshack.com/i/nfzuvfp
For some reason, both of them are chosen, even though maximize 3d performance is greyed out.
However, it still has the same performance as if SLI was disabled.

dreadloxx · Apr 3, 2014

clutchc :

Nvidia allows for different clock speeds now. E.g. You can have a oc/SC card sli with a non oc/SC version of the same card and each card will run on their native clock speeds

clutchc · Apr 4, 2014

@ Dreadloxx
That's good to know. Thanks

@OP
Even w/o the bridge, SLI should work. Just maybe not at its max performance. But your pic of the NCP is weird. It shows that SLI (maximize 3D performance) is already ticked and enabled... and greyed out! At the same time, it shows that the 'disable SLI' is ticked. I didn't think that combination would even be possible!

Have you run a FULL virus scan (after updating) lately? How about MalwareBytes? https://www.malwarebytes.org/
Something is corrupting your driver.

If there's still no joy, I would suggest this:
Uninstall the gfx driver again and run Driver Sweeper from safe mode (F8).
Have it scan for and remove any Nvidia, AMD, and ATI (graphic) driver remnants it can find. Something may be corrupting your registry.
Then re-boot and install the latest gfx driver for your cards and OS again.

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