It will run fine. I have the same model and I play it with 1280x720 resolution and Medium settings and it's very playable (about 30fps and more), with Low settings it runs really smoothly. All this with the default bootcamp drivers.
1920x1080 it's about 20 fps and lower and above fullhd it's a slide show even on low settings.
I highly recommend you consider some tutorials on getting a modded AMD Driver though. I have the same setup and I can punch out 1920x1200 on high with ~30fps. It induces the fight or flight response with me at this resolution, I might add.