Hi,
Far Cry 3 Recommended Requirements
CPU: Intel Core i3-530/AMD Phenom II X2 565 or equivalent quad-core
CPU Speed: Info
RAM: 4 GB
Video Card: Nvidia GTX 480/AMD Radeon HD 5770 or equivalent 1024MB DirectX 11 card
DayZ Recommended Requirements
CPU: Intel Core i5-2300 or AMD Phenom II X4 940 or better
CPU Speed: Info
RAM: 4 GB
OS: Windows 7
Video Card: NVIDIA GeForce GTX 560 or AMD Radeon HD 7750 with 1 GB VRAM or better
From the two titles you mentioned DayZ is clearly the one with higher requirements.
The CPU i5-2300 (5,295) vs i3-6100 (5,466).
So I would assume that the CPU will be good enough - you will know what gpu you have.
HTH