Will another graphics card make a bottleneck?

[nothintoulouse]

I currently have an Asus ROG Maximus VIII Gene, 16GB of 3000MHz DDR4 RAM, an i5 6600K 4x3.5GHz, an MSI GTX 1070 and I run my games off an SSD.

I was thinking about getting another 1070 and an SLI bridge. But my question is whether that will create a bottleneck with some of the other parts I have, as far as gaming performance goes.

Any advice?
Thanks in advance!

 

[nothintoulouse]

Bottlenecking is an over-used phrase.

Personally I'd be more bothered by mgpu support than cpu bottlenecking and would opt to sell the first 1070 and get a 1080 instead of a second 1070.

EDIT: Do you even need the extra performance, What resolution?

Well at 3440x1440 I play Assassins Creed Syndicate on Very High (4/5) settings at 35-40 fps on average and it would be great to have 60 fps on ultra settings.
The same goes for The Witcher 3 and Crysis 3.