Graphic Cards Performance of 1080 in SLI

The setup is a X99 setup with 1080s in SLI.
The initial 3D Mark run was with a high bandwidth bridge between the 1st and the 3rd slot.
The X99 setup apparently has the 1st and the 4th configured to support 16X.

Had the following results as shown in the snap.
What is surprising is that the 3rd result (the lowest is once I shifted the 2nd card to the 4th slot.
Should there not have been a performance jump going 2X16X?

The rig is currently running on a standard clock profile.
 

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