It is not a bad deal the G3220, since it´s Haswell-based; nor is it single core, it´s dual-core. That thing can overclock pretty good (4.5 or 4.6 GHz with Intel stock cooler).
In other words, most games will perform almost the same on both i5-4670K and G3220.
In other words, most games will perform almost the same on both i5-4670K and G3220.
Rig 1: Windows 10 Home | AMD A6-1450 @ 600/1000/1400 MHz | AMD Radeon HD Graphics 8250 | 4GB RAM | HP Pavilion TouchSmart 11.
Rig 2: Windows 10 Pro | Intel Core i7-2640M @ 780/2800/3500 MHz | Intel HD 3000 Mobile | 8GB RAM | Dell Latitude 6320.