Gaming GeForce GTX 1080 8GB GDDR5X SLI DirectX 12 VR Ready Graphics Card (GTX 1080 GAMING X 8G) Brand New unopened box $240.00 firm on price for Sale in Federal Way, WA - OfferUp
VR SLI: Accelerating OpenGL Virtual Reality with Multi-GPU Rendering | NVIDIA Technical Blog
Nvidia Gameworks VR SLI Test - YouTube
How NVIDIA Quadro RTX Makes Virtual Reality More Realistic | Engineering.com
Nvidia claims SLI is good for VR, might be interesting to test this : r/LinusTechTips
MSI GT73VR TITAN with 3840 X 2160 4K screen, nVidia SLI GTX 1070 Dual GPU