Yes, it will handle them just fine at medium. Though soon in the future you will need to upgrade. DDR2 memory is not fast enough to communicate with the GTX 660. Your CPU's while fast and yes there are two of them games like the Evil Within really don't rely on them much. One will do as well as two for gaming. The entire system is designed for data integrity, streamlining data, and pure raw data processing and lacks encoding capabilities. Very good deal if you just bought it though.
More important information though is what OS are you using, you may have some trouble getting a non-server based version of windows which you will need for better performance in your games. I may be able to find some information that may make your system...