Final (Fan?) Thoughts
My testing on the GeForce RTX 2080 Ti in NVLink versus the older Pascal-based GeForce GTX 1080 Ti in SLI was an interesting one, with some major highlights at the right resolutions of the sheer power of the Turing GPU architecture and super-fast GDDR6 memory.
NVIDIA's new GeForce RTX 2080 Ti cards in NVLink shred the GTX 1080 Ti SLI setup in games like Shadow of War at 4K with a huge 110FPS average with stock fans, and even better 123FPS average when the fans are at 100%. This allows the card to stretch a little further and keep its high GPU clocks that much higher, as the card is staying cooler.
Note: I'm only testing the Founders Edition graphics cards here, with some NVLink setups from custom RTX cards coming soon. I will be updating these results with RTX 2070 SUPER and RTX 2080 SUPER cards in NVLink in the coming days and weeks, too. But the FE cards do run hotter than custom cards, so the results will definitely change.
Shadow of the Tomb Raider on the GTX 1080 Ti SLI is already good at 94-103FPS (fans at stock versus 100%) but the RTX 2080 Ti in NVLink boosts that to 125-131FPS (fans at stock versus 100%). RTX 2080 Ti in NVLink is what you'll want for some Big Format Gaming Display (BFGD) action on a huge 65-inch 4K 120Hz TV or the super-fast 4K 144Hz G-Sync gaming monitors for Shadow of the Tomb Raider.
I've got some interesting results with SLI and NVLink setup with Overwatch, something I need to spend some time with testing but I was getting virtually 100% scaling at 4K and even 8K. I can load the game up to maximum resolution scaling (200%) with maximum AA applied and it was pushing 98-100% GPU consumption on both cards. Those results are in the making now.
Wrapping up, increasing the fan speed on SLI and NVLink setups is an obvious one and a move that will net you some more performance and in some cases up to 10% more which is a big win for an already high-end setup.