Multi GPU Index
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.
Max Support: 3x
Max Supported: 3x
As indicated by the PCI Express layout chart there are a total of three 16x PCI Express slots on this motherboard with all three 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.
The three 16x slots all use bandwidth directly from the CPU. This configuration changes if you are using a 28-Lane processor where slot #5 is only allocated 8x lanes. Slot #2 is the typical primary graphics card slot and will use 16x lanes of bandwidth provided you don’t populate slot #7. Slot #5 is the second primary slot and will always have 16x lanes of bandwidth when matched with a 40-lane processor. Overall I found the layout to be very well laid out giving you the best support for 2-way multi gpu configurations using air or watercoolers.
For best video performance you will want to populate slots #2 and #5 with video cards. For proper triple card configurations you'll populate slots #2, #5 and #5 and is something you can do with both 40-lane and 28-lane processors.