Running multiple graphics cards in an SLI or Crossfire configuration was always the reserve of the ultra-enthusiast. It was expensive, often less stable than a single card solution, and the performance gains were rarely even close to linear — even if you could find games to support it. In recent years support for Nvidia and AMD’s multi-card technologies has waned even further, suggesting that the idea of having more than one graphics card in a gaming system was dying.
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https://www.digitaltrends.com/computing/google-stadia-multi-gpu-gaming/