I'm going to try reinstalling drivers because something seems way off.
SLI scaling should work under DX11. It's broken with DX12. You are overreacting I think. Doom can be maxed out on a single 980Ti OC easily when running Vulkan. A potato runs Rocket League. Gears should get multi-GPU support later. Forza is a legitimate concern but it came out with its own CPU 1 core overloading issues. There are a lot of huge AAA titles where 1070 SLI OC is easily the best setup for 1440p/4K, far superior to 1080, beats Titan XP and is barely slower than 1080 SLI for $500 less. The gameplay experience between 980Ti SLI OC/1070 SLI OC and 1080 SLI OC will be nearly identical. The only real upgrade is $1200 Titan XP or even SLI.
"We'll start with 4K, where we see some fascinating results. The performance benchmark for the fastest single-chip solution money can buy is set by Nvidia's stupendous Titan X Pascal, and the benchmarks are revealing. In every case, GTX 1070 SLI beats the Titan. The margin may well vary from title to title, but the end result is clear - there's a cheaper route to achieving locked 4K, 60fps gameplay with minimal settings compromises than investing so much in the top-tier Titan. GTX 1070 SLI achieves similar results to Titan X on the hugely demanding Crysis 3, but other titles see big improvements. Rise of the Tomb Raider yoyos between 45-60fps on max settings at 4K during gameplay - GTX 1070 SLI is much more stable, with far less fluctuation from the target 60fps."
https://www.google.ca/amp/www.eurog...-2016-asus-strix-gtx-1070-1080-o8g-sli-review
The issue isn't only that SLI doesn't work but you spent $1400 on flagship 980Tis expecting it to work on day 1. As a consumer, you should expect it. But realistically, you overspent to future-proof for next gen games hoping SLI will benefit you. By the time those games arrived, it's possible to find 980Ti SLI / 1070 SLI for $600-700 all-in. At that point, suddenly it's those 2 setups vs. a far weaker 1080. No brainer to me. So next time never ever buy $700-800 flagships for SLI or you'll feel betrayed and ripped off as soon as $400 GV104 3080 drops. Just sell each 980Ti and add $200, should be enough for 1080/2080Ti . SLI (and CF) still make a lot of sense to me but in specific segments, ironically not at the ultra-high end anymore. On the NV side, right now SLI makes the most sense with x70 cards (470 SLI > 480, 570 SLI > 580, 670 SLI > 680, 970 SLI > 980, 1070 SLI > 1080).
If you think about it, you can go x70 SLI every generation, smash a single x80 mid-range into the ground, then when x80Ti comes out, sell each x70, and get a "free" x80Ti. It's the mid-range $600-700 x80 card that makes no sense anymore. My opinion