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 

P1020332 First Looks: Intel DX79SI Extreme Series X79 Motherboard

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.

P1020333 First Looks: Intel DX79SI Extreme Series X79 Motherboard

 

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

P1020334 First Looks: Intel DX79SI Extreme Series X79 Motherboard

 

CPU Socket Area

P1020340 First Looks: Intel DX79SI Extreme Series X79 Motherboard

 

8 Phase Power

P1020342 First Looks: Intel DX79SI Extreme Series X79 Motherboard

 

A CHiL8328 handles the power delivery

P1020337 First Looks: Intel DX79SI Extreme Series X79 Motherboard

 

Color co-ordinated SLi bridges in the accessories

P1020346 First Looks: Intel DX79SI Extreme Series X79 Motherboard

 

These are not the droids you are looking for.

Why Buy Page 01 First Looks: Intel DX79SI Extreme Series X79 Motherboard