You really need an i5 as the i3 might struggle with FC5.
Min CPU is a i5 2400.
Min Specs
OS: Windows 7 SP1, Windows 8.1, Windows 10 (64-bit versions only)
PROCESSOR: Intel Core i5-2400 @ 3.1 GHz or AMD FX-6300 @ 3.5 GHz or equivalent
VIDEO CARD: NVIDIA GeForce GTX 670 or AMD R9 270 (2GB VRAM with Shader Model 5.0 or better)
SYSTEM RAM: 8GB
Resolution: 720p
Video Preset: Low
Recommended Specs
OS: Windows 7 SP1, Windows 8.1, Windows 10 (64-bit versions only)
PROCESSOR: Intel Core i7-4770 @ 3.4 GHz or AMD Ryzen 5 1600 @ 3.2 GHz or equivalent
VIDEO CARD: NVIDIA GeForce GTX 970 or AMD R9 290X (4GB VRAM with Shader Model 5.0 or better)
SYSTEM RAM: 8GB
Resolution: 1080p
Video Preset: High