I connected all of the power connectors to both graphic cards, I tried putting SLI bridge backwards and forward. My Nvidia control panel does not have SLI option, I searched PhysX and 3D setting menu, but there's nothing!!
It can detect both cards just fine, but there's no SLI option!!
When I run FurMark, only my primary GTX560ti is being used.
I used one gpu at a time, both works fine separately. I did a clean uninstall with driver fusion(driver sweeper) and I tried the latest video driver and the latest beta driver, but there's still no SLI option in the control panel.
I did my research and saw that SLI is possible with different vendor/cards as long as the chipset is the same, both are GTX560. I tried uninstalling and reinstalling the Nvidia over 5 times, still nothing! Someone helpppppppppppp!
Can I mix and match graphics cards that have different GPUs?
No. For example, an XXXGT cannot be paired with a XXXGTX in an SLI configuration.
Can I mix and match graphics cards from different manufacturers?
Using 180 or later graphics drivers, NVIDIA graphics cards from different manufacturers can be used together in an SLI configuration. For example, a GeForce XXXGT from manufacturer ABC can be matched with a GeForce XXXGT from manufacturer XYZ.
Can I mix and match graphics cards if one of them is overclocked by the manufacturer?
Yes. A GeForce XXXX GTX that is overclocked can be mixed with a standard clocked GeForce XXXX GTX.
Can I mix and match graphics cards with different sizes of memory?
When purchasing a second graphics card, you should try to match the memory size so that you are ensured full value and performance from your purchase. However, while it is not recommended, NVIDIA does offer the flexibility to run graphics cards with different sized memory by using CoolBits. Using CoolBits (value set to 18), you can force both of the cards to use the lower of the two memory sizes and operate them together in SLI mode. When dissimilar memory sizes are enabled to work together using CoolBits, the effective memory size for each card becomes the smaller of the memory sizes.