Low FPS with Dual Radeon HD 6800s
HIS Radeon HD 6870s specifically. a few year old configuration but it should be enough to handle this game smoothly. I also have 8 GB RAM and an i7-2600K CPU @ 3.40GHz and am playing at 1920x1080.
The issue isn't very cut and dry and here's what I've seen: It doesn't matter what my settings are, but the game will run smoothly for a few minutes each time I first launch it. After a little bit I start to get some FPS lag, especially when turning. This slowly gets a little worse and basically makes the game unplayable. The settings can be maxed on ultra or all on low and it's the same results either way. The only way I've gotten some better performance is by lowering the resolution scaling which makes the game look like absolute crap. Same result whether it's windowed mode or not.
I haven't had time to explore too many options, but I'll continue to try some things and would love some suggestions/help on this.