If you check Youtube there are a few videos showing the hd 6670 playing AC3. However don't expect to run it at full settings. As far as I can tell it is 2gb gddr3, so it may not perform as well as the gddr5 version. Although saying this I am struggling to find a 2gb gddr5 version.
thanks for reply but i want to ask that can vtx radeon hd 6670 run assassin creed 3 on medium setting .