Apple gave a multi-GPU lecture to AMD and NVIDIA with the M1 Ultra! - TechnoPixel
The Rise and Fall of Multi-GPU Graphics Cards | TechSpot
Apple M1 Ultra solves a multi-GPU problem that's been plaguing AMD and Nvidia | TechRadar
AMD - What's the Best Graphics Card of 2011? According to PC Magazine it's the dual-GPU AMD Radeon 6990! Simply put, it's the fastest discrete video processing you can get! Check it
The Rise and Fall of Multi-GPU Graphics Cards | TechSpot
Dual GPUs, why are neither NVIDIA nor AMD currently making them? - The Tech Zone