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Unless i missed it in the manually. Which slots would 2 way SLI use?
 
It is strange that there isn't even a second 16x option. This might kill my plans to upgrade to the dark (from gaming 9)
 
14. PCI-E Slot x16/x8
15. PCI-E Slot x8
16. PCI-E Slot x8/x4
17. PCI-E Slot x4

Taken from page 27 of the Dark PDF
 
PCIe Lane Distribution (Core™ i9-79xx, 44 Lane Processors)
 
PCIe Lane Distribution (Core™ i9-79xx, 44 Lane Processors)
 PE1 – x16 (Gen3, x16 lanes from CPU, x8 shared with PE2)
 PE2 – x16 (Gen3, x8 lanes from CPU, shares 8 of PE1’s 16 lanes)
 PE3 – x16 (Gen3, x8 lanes from CPU, shares 8 of PE4’s 16 lanes)
 PE4 – x16 (Gen3, x16 lanes from CPU, x8 shared with PE3)
 PE5 – x4 (Gen3, x4 lanes from PCH)
 PE6 – x16 (Gen3, x8 lanes from CPU or x4 from PCH based on configuration)
o When populated by a video card x8 Gen3 lanes are allocated from the CPU
o When populated by a card using x4 or x1 lanes, and M.2 80mm slot is populated PE6 receives x4 lanes from the PCH
 
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PCIe Lane Distribution (Core™ i7-78xx, 28 Lane Processors)
 PE1 – x16 (Gen3, x16 lanes from CPU, x8 shared with PE2)
 PE2 – x16 (Gen3, x8 lanes from CPU, shares 8 of PE1’s 16 lanes)
 PE3 – x16 (Not functional on 28 lane processors)
 PE4 – x16 (Gen3, x8 lanes from CPU)
 PE5 – x4 (Gen3, x4 lanes from PCH)
 PE6 – x16 (Gen3, x4 lanes from PCH)
o Must be enabled in BIOS, which disables M.2 80mm