MSI X370 Krait Gaming Motherboard Review

The Hardware Asylum Multi-GPU index is a portable set of data we can use to determine the multi-GPU potential of any motherboard.  A higher index number indicates a favorable condition for multiple graphics cards while a lower number indicates a hindrance in one of our leading indicators.  Since the Index is not dependent on system architecture it can be applied to any motherboard regardless of processor or chipset generations.

NVidia SLI
AMD Crossfire

Index: 3.25
Optimized: 2x
Max Support: 3x

This motherboard will support up to three graphics cards and is optimized for dual card operation. 

For best video performance you will want to populate the top most 16x PCI Express slot with your video card and try to avoid using the secondary slot.  The secondary slot is hardwired to 8x PCI Express lanes and only active if the slot is populated.