how fast will dayz standalone run on my computer

so im new to pc gaming so im only just learning the ropes when it comes to building your own computer. so i was wanting to know how fast would dayz run on my computer my specs: AMD A4-5300 APU with Radeon(tm) HD Graphics
3.4GHz 8gb ram Microsoft Windows 8 (build 9200), 64-bit and im getting a gtx 660, also i was wanting to know if its worth instead just buying a 560? any guess on the average fps it would run at??