Poorly as in its the worst optimized game I've ever seen.
Lets be honest, COH2 looks nice but not that nice, and even graphically inferior to COH1 imo. Its no Far Cry 3 or Crysis or anywhere even in the same league. But yet it gets the worst and most unpredictable performance of any game out right now. They didnt even bother to make SLI and Crossfire work lol. It's just a superglue and bubble gum job all the way.
To put in perspective the reference GTX 780 is at 900Mhz, this card came with 1060 out of the box, and it went to 1200Mhz without a fuss. I think 1250 or 1300Mhz is probably doable. At this speed we're approaching the same performance as the 780 Ti.