Scalable Link Interface(SLI) is a brand name for a multi-GPU solution developed by NVIDIA for linking two or more video cards together to produce a single output for improving graphics performance.
CrossfireX(previously known as Crossfire) is a brand name for a multi-GPU solution developed by AMD, originally developed by ATI. The technology allows two or more video cards to be used in a single output to improve graphics performance.
For Intel chipset platform, the below ECS's motherboards can support SLI feature. We recommend you to choose the below motherboards to configure SLI.
Socket 1366:
X58B-A3 SLI (V1.0)