http://community.darksiders.com/forum/viewboard seems to have prior discussions about optimizing but the PC you shared is not ready for almost any gaming. And even with the usual, http://us.acer.com/ac/en/US/content/model/DT.SRPAA.008 shows this to be unready for a gaming card. So let's note what will help a lot. I am going to shortchange you heavily since the card I note is so well discussed.

Install this one -> http://www.newegg.com/Product/Product.aspx?Item=N82E16814150565&Tpk=CNET

As to BF4, no.
Bob