I try just some minutes but kill or hit a springbok is almost impossible ? also I don't know if just my impression or not but naked I can reach the sprinbok a little closer than with an armor.
My specs:
windows 8.1
I7 4790
16 gb ram
gtx 750ti 2gb
No ssd
With these I have from 15/20 to 17/30 fps with medium/high settings I don't notice any big fps drop swithcing from medium to high. Also I set dx11 (dont know If I My pc support dx12)
Haven was good but, at the end, I prefer the very old solution , all the city/villages as starter with trainer npc, etc. You can choose GK as starter city but you must know that could be much difficult to train and learn there.