Railworks America

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I mean the new pascal cards still work with SLI, as if you'll need it.

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OD
With only about 300K users worldwide I'd say it was pretty dead already? (12,000,000 video cards sold in 2014)
Too difficult to set up and dubious performance and eye candy gains over a single card?
pH

I'm running 4K with 2x GTX 1080 in SLI. I need it in some cases to maintain 60fps and for the lowest frametime. I'm one of those people that actually sees a difference between 60fps and 30fps (It makes me dizzy).

I think its a toss up.. At some point, I highly doubt you'll need SLI. I have a card coming later today that has four hdmi ports on the back of it and supports three screens ( for one picture ). SLI was a step in the right direction, but i think its days are numbered.. NVidia has other plans..

Currently, the second most powerful supercomputer in the world (Titan ) uses all NVidia GPU's to accelerate processing. What this says, is that computing is on the doorstep of entering a completely new realm that will make the computers we have now days about as obsolete as a horse and buggy. I wont speculate on the science fiction world of tommorrow with this new technology, but it's going to be able to encompass everything we do now, and a whole lot more, from our desks at home, including our games..

For some this will be a sad thing. For others it'll be another step into the future ( imagine your taxes done in five seconds ).

Think about it.. This thing below is using Graphics cards to deliver 13.7 petaflops ( billions of calculations per second ) of performance..