It looks like the Arkham Knight PC saga is finally over, though it looks like the game was too broken to get all of the features it promised working properly. While Arkham Knight has been available to buy on Steam once again for a few weeks now, we were still expecting one last patch for multi-GPU support, unfortunately, it looks like it won't ever be coming.
The game runs okay at this point on single cards but Warner has also been promising an SLI/CrossFire fix since it began outlining its patches over the summer. However, according to one of the developers over at WB, the team just didn't want to risk it anymore.
Answering a question on the Steam Forum, a WB developer account said: “We’ve been working with our development and graphics driver partners over the last few months to investigate utilizing multi-GPU support within Batman: Arkham Knight. The result was that even the best case estimates for performance improvements turned out to be relatively small given the high risk of creating new issues for all players.”
Since the gains were minimal, likely due to deeper issues with the game and the way it was created from the beginning, the team stopped pursuing multi-GPU support in-case it caused any more issues, just after finally getting the game working to an acceptable standard.
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KitGuru Says: Unfortunately, due to the lack of CrossFire or SLI support, it seems playing this game at 4K/60fps will be out of reach with the current crop of high-end GPUs. Are any of you running a multi-GPU set up? I was an SLI user myself until quite recently.