If you look closer the clip on the left corresponds to the leftmost 2 pins. That's an 2+6 pin PCIe connector.
To me the left one looks like it can split, possibly. Looks like an 8 pin PCIe connector too.
It would require a new die with a different memory controller. Unlikely Nvidia would bother with that.
Or they could use a severly cut down GP104 . That's not as crazy as it sounds , that is after all nothing more than a mid-range GPU, size wise. Regardless, how many different 1060s are there...
The shimmering is caused by high frequency detail or simple aliasing, that's normal. Nothing you can do about that other than to enable higher quality anti-aliasing.
Here the game running on max settings on my PC. Same behaviour.
So to sum it up, nothing is out of place.