I know that there are probably very few left using a traditional SLI setup. My backup computer is still using 3x GTX680 in SLI. SLI only works with DirectX 11, and new games generally don’t support it at all, but WoW still has an SLI profile and has continued to work well. Since WoW is the only game that the backup computer would ever be used to play, I’ve stuck with those cards in the SLI configuration. Performance is actually pretty good when it works, similar to a GTX 980 Ti or a GTX 1070.
What I’m noticing now is very different behavior between using “DirectX 11” and “DirectX 11 Legacy”. I don’t recall that necessarily being an issue prior to the Dragonflight pre-patch, so I’m wondering what might have been changed.
At first, I thought SLI was working okay even with regular DirectX 11, as the GPU load appeared to be evenly split among my 3 GPUs. But then I noticed that GPU usage on each GPU was not rising above 40% or so and my FPS seemed much lower than normal. Once I switched to DirectX 11 Legacy all of a sudden I was seeing 80%+ GPU usage on all 3 GPUs and my FPS skyrocketed.
Probably my best bet is to just keep it on DirectX 11 legacy, but I know that the newer DirectX 11 has some multi-threading advantages, and I wonder if there might be something going on that can actually be fixed/changed.