What is SLI?
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Solved by Oshino Shinobu,
Essentially. SLI is two cards working together to render frames. You cannot SLI a 960 and a 970 together. It must be the same GPU, with the same amount of vRAM. Speeds, brand and size can all change, so long as they are the same GPU (so a 970 with another 970, or a 980Ti with another 980Ti) and the same amount of vRAM.
Running a card as dedicated PhysX is possible, but it does not require SLI. It is also pointless with high end cards like the 970 and 960. You'd be better off selling the 960 than using it for PhysX. It will not improve performance, will generate more heat, consume more power and not all games use PhysX in the first place.
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