You can connect three or four GTX 1080s together using the LED-lit SLI bridges that appeared over the last year or two. Traditional single-slot SLI bridges won’t work. Then you’ll need to download an Enthusiast Key generated for your specific, individual GPUs from a new Nvidia Enthusiast Key website, which isn’t live yet but will be in time for the GTX 1080’s May 27 launch. Running the Enthusiast Key on your machine will unlock 3- and 4-way SLI functionality, as well as crank the LED SLI bridge’s clocks up to the same 650MHz as the new SLI HB bridges.
Oh, but Nvidia’s not guaranteeing that this Enthusiast Key will necessarily work in any specific games. You’re on your own taking this overpowered path.
Realistically, unless developers go the extra mile to add in DirectX 12 multi-display adapter support—which first appeared in Stardock and Oxide’s Ashes of the Singularity—it sounds like 3- and 4-way SLI is being all but written off for dead going forward. If we’re being honest, few gamers rocked such fire-breathing rigs, and multi-GPU support in general seemed lackluster in 2015, with numerous top-tier games failing to support SLI or CrossFire for months after release. So the real-world impact may be minimal, a problem for PC gaming’s proverbial 1 percent.
But damn if it still doesn’t feel like the end of an era. It’ll sure be interesting to see if AMD’s Polaris GPUs support 3- and 4-way CrossFire setups when they launch later this year.
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