NVIDIA's new SLI HB bridge pictured, GTX 1080 supports 2-way SLI only
ZOTAC SLI HB Bridge (2 Slot) | ZOTAC
Asus ROG Strix GTX 1080 Ti OC review: top-tier SLI tested | Eurogamer.net
Amazon.com: MSI 2WAY SLI HB BRIDGE L (on 1st and 5th Slot), Black with Red LED Backlights, Supports MSI GTX 1080 Ti/1080/1070 Ti/1070 graphics cards : Electronics
NVLink vs. SLI and Multiple GPUs - Is it worth it?
Check out GTX 1080 Ti SLI Frame Rate Performance - Tomb Raider 8K