The DX79SI supports triple slot multi-GPU SLi and Crossfire setups, and here are some of the PCI-E 3.0 compliant bridge chips (Pericom 3415ZHE) taking care of things 

At the bottom of the board we can see a PORT-80 for POST diagnostics, Power and Reset buttons as well as the other connectors for Front Panel Audio and USB.


The board only has two 6Gbps (blue) + four 3Gbps ports (black), all of which come from the X79 chipset


CPU Socket Area


8 Phase Power


A CHiL8328 handles the power delivery


Color co-ordinated SLi bridges in the accessories


These are not the droids you are looking for.

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