I have the following hardware configuration:
PSU: Corsair HX1200i CPU: Inter Core i7-6800K 3.4 MHz GPU: NVIDIA GTX 1080Ti (Pascal) RAM: Corsair Vengeance (DDR4) 32GB, 2666MHz SSD: M.2 Samsung 960 500 GB Motherboard: ASUS SABERTOOTH X99
And, I wonder, would it be simple to extend this system with 1 extra 1080Ti GPU?
As I know, the motherboard should be capable to provide x16 lanes for both GPUs. Though probably I'll need another PSU, and I am not sure about CPU.