MSI SLI HB Bridge M NVIDIA GPU 2-Way Bridge Connector MS-4395 for PC Graphics

NVIDIA SLI Bridge - ASUS ROG Dual GPU Link Cable

ASRock NVIDIA SLI HB Bridge 1S Card SLI/CrossFire Ready

EVGA PRO SLI BRIDGE HB (2 Slot Spacing) Model 100-2W-0027-LR

ASUS ROG Republic Of Gamers 3 Way NVIDIA SLI Bridge

ASUS ROG 2M HB 2-Way SLI Bridge Rev. 1.00 High Bandwidth 49-4

3-Way NVIDIA SLI Bridge for ASUS – High-Performance Multi-GPU Setup – Model 60SC

an NVIDIA SLI connector to bridge multiple graphics cards together.