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I'm currently running 1080 Ti SLI - I've been running an SLI configuration for the last several generations of cards (and I ran Crossfire setups before then) and I've had a great experience with it. There have been a few games in the last year or two that have been released without multi GPU support, which was disappointing (I played those games via other means as a result) - but then there have been developers like the folks that do the Tomb Raider series who have done a nice job implementing multi GPU support on the regular.
I'm really not sure what's going on with the developers at this point and multi GPU support - DX12 & Vulkan have multi GPU support built into the API to make it so the developer can just implement on their own without requiring assistance from NVidia & AMD with specific profiles. I would expect developers to take heavy advantage of this as it would only be seen as good PR for them and help their customer base have better performance in their games.
For my part, I plan to stay in the multi GPU arena for at least another cycle when I get around to upgrading - I've gotten used to playing my games in 4k / 60fps butter smooth and I have no desire to throttle back from that experience. I'm just not buying AAA games at this point that don't have multi GPU support.
For you, OP, I would caution on buying a 2nd 1080 Ti right now unless you can get it dirt cheap, and the reason is because of the way NVidia is going about SLI support with Turing - for a number of driver releases now, for certain games, they seem to be enabling SLI only for Turing GPUs which leaves a sour taste for me as it's definitely a strong-arming technique by NVidia to try to funnel people into Turing since it's been slow in its adoption by the customer base (likely due to the poor performance increase versus high price ratio). The Turing GPUs moved to NVLink as their interface between the cards which is a great thing, but NVidia is using it as a way to try to force people onto Turing, so you might stick with your 1080 Ti for now, and then down the road when you move to a newer architecture, look into multi GPU support as that way you don't have to first buy the HB SLI Bridge (for Pascal) and then have to change it again by buying another interface hardware device such as the NVLink connector (which isn't cheap).
Hope this helps!
I'm really not sure what's going on with the developers at this point and multi GPU support - DX12 & Vulkan have multi GPU support built into the API to make it so the developer can just implement on their own without requiring assistance from NVidia & AMD with specific profiles. I would expect developers to take heavy advantage of this as it would only be seen as good PR for them and help their customer base have better performance in their games.
For my part, I plan to stay in the multi GPU arena for at least another cycle when I get around to upgrading - I've gotten used to playing my games in 4k / 60fps butter smooth and I have no desire to throttle back from that experience. I'm just not buying AAA games at this point that don't have multi GPU support.
For you, OP, I would caution on buying a 2nd 1080 Ti right now unless you can get it dirt cheap, and the reason is because of the way NVidia is going about SLI support with Turing - for a number of driver releases now, for certain games, they seem to be enabling SLI only for Turing GPUs which leaves a sour taste for me as it's definitely a strong-arming technique by NVidia to try to funnel people into Turing since it's been slow in its adoption by the customer base (likely due to the poor performance increase versus high price ratio). The Turing GPUs moved to NVLink as their interface between the cards which is a great thing, but NVidia is using it as a way to try to force people onto Turing, so you might stick with your 1080 Ti for now, and then down the road when you move to a newer architecture, look into multi GPU support as that way you don't have to first buy the HB SLI Bridge (for Pascal) and then have to change it again by buying another interface hardware device such as the NVLink connector (which isn't cheap).
Hope this helps!