In the case of graphics cards generation Pascal NVIDIA company decided for the enthusiast that 3-Way SLI mode and 4-Way SLI in most games it is not necessary , and therefore develop and maintain only a duets of two graphics cards. A certain logic exist in this optimization is. Trios and quartets cards can be seen more frequently in experiments with extreme overclocking, but in everyday reality are very few inhabitants.
Polaris graphics cards generation did not refuse to support CrossFire X mode for three or four cards. At least in the DirectX 11. DirectX 12 support responsibility falls on software developers . Nevertheless, AMD representatives noted that the performance scaling when combining in one system more than three cards is less marked than in the union of two or three cards, and therefore such a configuration is not popular.