EVGA X299 Micro 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.

Index: 5
Optimized: 2x
Max Support: 3x

Index: 4
Optimized: 2x
Max Supported: 3x

Index: 2.75
Optimized: 2x
Max Supported: 3x

NVidia SLI
AMD Crossfire

As indicated by the PCI Express layout chart there are a total of three 16x PCI Express slots on this motherboard with two of them using bandwidth earmarked for video cards.  The configuration is rather unique because you are given a choice of bandwidth allocations depending on your system configuration and processor selection.

The top two 16x slots use bandwidth directly from the CPU.  This configuration changes if you are using a 44, 28 or 16-Lane processor where the number of lanes to each slot will change.  At first I found this to be a little strange however it makes sense to run an dual 8x configuration for a 16-Lane CPU as it simplifies the lane switching for larger processors. 

For best video performance you will want to populate slots #1 and #3 with video cards but, you already know that given how small this motherboard is.