Well firstly your CPU isn't not qualified to play Far Cry 4 optimally, the game requires an i5-i7 for optimal gameplay.
Minimum System Requirements
•Operating system: Windows 7 SP1, Windows 8/8.1 (64bit versions only)
•Processor: Intel Core i5-750 @ 2.6 GHz or AMD Phenom II X4 955 @ 3.2 GHz.
•Memory: 4GB.
•Video card: NVIDIA GeForce GTX 460 or AMD Radeon HD5850 (1GB VRAM)
•Direct X: Version 11.
•Hard Drive: 30 GB available space.
Recommended System Requirements
•Operating system: Windows 7 SP1, Windows 8/8.1 (64bit versions only)
•Processor: Intel Core i5-2400S @ 2.5 GHz or AMD FX-8350 @ 4.0 GHz or better
•Memory: 8GB
•Video card: NVIDIA GeForce GTX 680 or AMD Radeon R9 290X or better (2GB VRAM)
•Direct X: Version 11
•Hard Drive: 30 GB available space
•Sound Card: DirectX 9.0c compatible sound card with latest drivers
You do not even meet to minimum requirements. My old Haswell socket 1150 quad core i5 4460 could just amount manage the game but did cause drops in the starting town. I should really try my i7 with it at some point.
I recently tried DAYZ Standalone again (use to get 30fps with my i5) and I was amazed I was getting a straight 60fps on high settings thou I didn't like the game after half an hour I got bored. Far Cry 4 should be easy for my i7 when I try it out then.
Get a better CPU socket 1155, just to note the fastest CPU for your socket is an i7-3770K.