So I've got 2 Strix 1080 Ti's for SLI and both of them had same whine, so maybe it's just a bad batch. But after taking them to the store for refund they tested it and claim there was no coil whine. So for now I am waiting to test them on different PSU in my friend's rig.
I tested at home with 2 PSUs, but both are same lineup Supernova P2 (1200 & 650) so maybe different PSU brand will decrease it or eliminate whine.
If not I guess I will suck up restocking fees (as I don't like dealing with Asus RMA) and wait for EVGA 1080 Ti FTW3 to release. Only reason I got Asus was to have Aura support since the rest of my rig is Aura compatible.
I've heard from technician in store that 1080 Ti's are common with coil whine, better chance with 1080s.
Also logically with OC cards coil whine is much more louder, I've heard people say there is no coil whine on non OC editions of Strix.
My 980 Ti's had coil whine and I really hoped to get rid of it when upgrading:
So for now until I wait to test my Asus GPUs with Corsair PSU I decided to pre-order EVGA FTW3 ones. I kinda like that they are 2 slot cards and this will work better in SLI in terms of temps, until I can get water blocks. And probably will be easier to sell in the futureEdited by InhexSTER - 4/17/17 at 2:01pm