Just like I said in my previous article covering the RTX 2070 SUPER cards in NVLink, I don't recommend buying two RTX 2080 SUPER cards in NVLink, either. Sure, some of these results are rather tasty but you're spending $1400 on graphics cards that would be better spent on a single RTX 2080 Ti.
The two RTX 2080 SUPER cards in NVLink fall right in between the performance of the RTX 2070 SUPER NVLink and RTX 2080 Ti NVLink results, and completely smash the Radeon RX Vega 64 CrossFire (if you forgot that I tested them, the results are at the BOTTOM of the charts). Radeon VII and Radeon RX 5700/XT do not support CrossFire so I didn't bother.
Where the RTX 2070 SUPER in NVLink could 'only' do 112FPS average in Shadow of the Tomb Raider at 4K, the spruced up RTX 2080 SUPER cards in NVLink hit the magical 4K 120FPS mark. Shadow of War also sees some good SLI scaling at 4K and 1440p, too.
I've got some GTX 1080 Ti SLI and TITAN Xp SLI results coming soon, as well as a larger Core i7-8700K versus Ryzen 7 3700X (and then Ryzen 5 3600) coming soon. Also some 3440x1440 and 8K results in SLI, NVLink and CF.
Control and Wolfenstein: Youngblood launch in the next few weeks, so I'll be running them through their paces, too.