Help with Motherboard Tweet

[SeriousTyro]

Hi,
I am helping my girlfriend build a system for Octane.

I already bought this motherboard, thinking I would want to overclock the cpu
https://www.asus.com/us/Motherboards/RO ... /overview/

We plan on getting a GTX 1080 Ti and possibly another one in the future.

I have a GTX 670 gathering dust and I am not sure if this motherboard would fit another GPU, for a total of 3 ( 2x 1080 Ti & 1x 670).

Should I return this motherboard and opt for one that would be future proof, in the sense of expanding GPUs?